Fuel pressure issue - 95 Astro - please help

[dave...@gmail.com]

Can someone please help me figure this out? I am really stuck.

I have a 1995 CHEVROLET TRUCK ASTRO VAN 2WD
6 Cylinders 262 W 4.3L CPI. 105,000 miles

Symptoms:
The van is cutting out like it is running out of fuel while driving.

I let the van warm up first before a test drive. It drives okay (not
great) at first, then it starts acting like it is running out of gas.
It bogs down and stalls when I accelerate. I tried flooring it and it
wants to die. This problem is progressive meaning it is getting worse;
now it happens after just a couple miles of driving. The problem will
go away (van drives much better) after turning off the van and then
back on.

History:
Fuel pump quit working over new years. I replaced and it drove fine.
I drove one 300 mile trip then another 300 miles of city driving with
no problems.

It got real cold (irrelevant?). I drove for 25 miles with no issues.
I filled up with gas (irrelevant?) after work and drove 10 miles and it
started acting up.

The problem got worse over the next couple days (60 miles city
driving).

I changed the fuel filter which was clogged and appeared to be the
original filter. It seemed to run fine. I drove several very short
trips 5 miles which may have been too short to notice symptoms. I
filled up again, then drove 15 miles.

It acted worse than ever.

I checked the fuel pressure. It was about 62psi with the pump running
but dropped to 6psi when not running.

I replaced the CPI unit and the nut kit (fuel lines). The fuel
regulator was leaking. I could see where the gas had cleaned the
inside of the plenum.

I retested fuel pressure. It was 62psi with the pump running but
dropped to 22psi with the pump off. My Haynes manual said it should
only drop 3-10psi with the key off.

I road tested the van and it has the same symptoms.

Shouldn't I be able to see or smell the gas that bleeds off? I
don't see any gas (I will double check tonight).

Now I do not know what to do. I am stuck. Can anyone offer any
suggestion?

[Don Baker]

There is a "sock" type filter for the big chunks at the fuel pickup in the
tank. If these plug / clog or collapse they can cause similar problems.

Good luck,
Don

<dave...@gmail.com> wrote in message
news:1107460924.6...@c13g2000cwb.googlegroups.com...

[Dog]

Sounds like a plugged gas filter. It is on the inside of the chassis on
driver side just in front of wheel well.It is a canister about 2 inches in
diameter and about three inches long . Careful when removing hoses as they
are under pressure and wear safety glasses .
"Don Baker" <n2...@comcast.net> wrote in message
news:wtGdnWN1I6m...@comcast.com...

[Dog]

Sounds like a plugged fuel filter. You can find it on the chassis on driver
side just in front of the wheel.....

"Don Baker" <n2...@comcast.net> wrote in message
news:wtGdnWN1I6m...@comcast.com...

[aarcuda69062]

In article
<1107460924.6...@c13g2000cwb.googlegroups.com>,
dave...@gmail.com wrote:

You need to determine if this thing is going too rich or too
lean when it acts up. Ideally, a test drive with a scan tool
installed so you can view O2 sensor volts and the fuel trim
numbers. Plug color and watching the O2 sensor on a DVOM is a
do-able method if you don't have a scan tool.

The fuel pressure shouldn't drop off as it does, weak pumps
and/or a failed pulsator usually manifest themselves as hard
starting after an overnight set. Entirely possible that it's the
CPI and regulator (again), who did you get those components from?

Did you re-use the old pulsator when you changed out the pump?
Pulsator = the oval shaped piece that connects the fuel pump
outlet to the sending unit , black plastic with a stamped tin
cover.

[KENG]

A clogged catlytic converter can cause similar symptoms. Given that you
likely have a vortec vin "W" 4.3, I would think this would be more
likely. 4.3 vin "W" uses an oddball fuel injection prone to leaks that
would make a clogged converter more likely. A converter simplified is
either filled with platinum pellets or has a honeycomb of platinum (no
flames, guys remebmber I said simplified) for the exhaust to flow
through. This material catalyzes excess hydrocarbons (unburned gas) into
H2O CO2 and H2SO4 along with a few other minor trace byproducts. BTW
H2SO4 us what causes that rotten "egg smell" you sometimes get. When a
rich condition (as results from a leaking injector) the pellets (worst)
or honeycomb (better) overheats and can even melt. Pellets melt into a
solid slug in the that can almost completely block the converter making
your car very constipated. The symptoms are that it starts and idles
fine, might even run ok when you drive very softly, but when you put
your foot in it it feels like you shut the motor off. Happened to me
once in a 91 Celebrity, and was really strange. Like I said it would
start and idle fine, when I put it in gear, it would accellerate ok if I
feathered the throttle. If I kept on like that, I could get up to
highway speeds, but the minute I tried to accellerate any faster, it
would fall on it's face. Picture this, 35 mph 4th gear steady, step on
the gas, it downshifts to 2nd at 4000 rpm an slows down rather than
speeds up.
KenG

[dave...@gmail.com]

Thanks for the suggestion. That sounds like it is very likely what is
wrong.

I did have a leaky fuel injector that I just replaced. I will get the
converter check/changed saturday if necessary.

Thanks

[dave...@gmail.com]

I do not think I replaced the pulsator, unless it came with my autozone
pump. The CPI and nut kit where ACDelco parts.

I kind of think it might be the catlytic converter now. That is what a
couple people have told me and it seems like these symptoms could be
caused by a clogged converter. I will test it first since it is a bit
easier. Then I guess I will either do the test drive you suggested and
change the pulsator.

Thanks for the suggestions,

Dave

[KENG]

Make sure you have it checked out before you replace it. A good muffler
shop has a guage they can install in place of an O2 Sensor that
indicates exhaust backpressure. Please let us know what the final fix
is. We all can make suggestions here, but having feedback to let us know
if we actually helped (or not) is what we always look forward to.
KenG

[Lawrence Glickman]

If you would get a data logger, do they have them for a 1995 car/van ?
///////////////////////////////////////////////////////////////////////////////////////////////////////////

My fuel pressure is _supposed to be between 35 and 45 psi according to
the book, but I see on SOME occasions it goes outside those bounds,
especially while idling. In fact, it seems only while idling. So I
don't know what that is all about. NO DTC CODES either thrown or
pending, according to my OBDII scanner. But my data logger picked
this up. Notice what happens at the 13 minute point when I was idling
the car while eating lunch one day....

Fuel pressure doesn't come back to normal until minute 25, when I
accelerate and travel off again.

For 11 minutes my system was over pressurized, but no MIL or DTC
codes. And out of 115 trips on this particular log, it only happened
this _once_.

Anyhow, if you can fit a data logger on a 95 Astrovan ( haven't a clue
if you have an OBDII port ) you can use a data logging chip to watch
your fuel system while you drive around.

////////////////////////////////////////////////////////////////////////////////////////////////////////////
CAUTION:
BANDWIDTH BUSTER AHEAD:
////////////////////////////////////////////////////////////////////////////////////////////////////////////

NOTE: the three digits on the right, two to the left of the decimal
point and one to the right, show fuel pressure at 5 second intervals
from start of engine.

Time into trip is left of that

If you do this, you have narrowed down one possibility. And you can
log fuel trims right along with that.

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Title : View / Trip Log / Trip 22 / Plot / Fuel Pressure (psi) / Start
Time
Rows : 1
Columns : 1
Column 01 : Start Time []
1/21/2005 1:56 PM

Title : View / Trip Log / Trip 22 / Plot / Fuel Pressure (psi)
Rows : 606
Columns : 2
Column 01 : Elapsed Time []
Column 02 : Fuel Pressure (psi) [psi]
0:00:00 48.7
0:00:04 47.4
0:00:09 46.6
0:00:14 46.1
0:00:19 46.6
0:00:24 44.4
0:00:29 44.8
0:00:34 43.1
0:00:39 45.7
0:00:44 40.5
0:00:49 44.8
0:00:54 39.6
0:00:59 41.8
0:01:04 39.2
0:01:09 41.3
0:01:14 40.5
0:01:19 38.3
0:01:24 38.7
0:01:29 40.5
0:01:34 41.3
0:01:39 39.2
0:01:44 38.7
0:01:49 41.8
0:01:54 40.0
0:01:59 37.9
0:02:04 40.0
0:02:09 39.2
0:02:14 40.5
0:02:19 41.3
0:02:24 38.3
0:02:29 39.2
0:02:34 40.5
0:02:39 39.2
0:02:44 40.5
0:02:49 39.6
0:02:54 40.5
0:02:59 40.5
0:03:04 38.7
0:03:09 40.0
0:03:14 38.7
0:03:19 39.2
0:03:24 39.6
0:03:29 39.2
0:03:34 37.9
0:03:39 39.6
0:03:44 38.7
0:03:49 38.7
0:03:54 39.2
0:03:59 39.2
0:04:04 38.7
0:04:09 39.6
0:04:14 40.9
0:04:19 38.7
0:04:24 38.3
0:04:29 40.0
0:04:34 40.5
0:04:39 40.0
0:04:44 39.2
0:04:49 39.6
0:04:54 40.0
0:04:59 38.7
0:05:04 40.5
0:05:09 38.7
0:05:14 40.5
0:05:19 40.0
0:05:24 38.7
0:05:29 40.5
0:05:34 39.2
0:05:39 38.7
0:05:44 38.7
0:05:49 39.6
0:05:54 41.3
0:05:59 38.7
0:06:03 38.7
0:06:08 41.3
0:06:13 37.9
0:06:18 39.6
0:06:23 38.7
0:06:28 38.7
0:06:33 38.7
0:06:38 40.0
0:06:43 39.6
0:06:48 38.3
0:06:53 40.5
0:06:58 40.5
0:07:03 39.6
0:07:08 39.6
0:07:13 40.9
0:07:18 38.7
0:07:23 38.7
0:07:28 39.2
0:07:33 39.6
0:07:38 39.6
0:07:43 37.9
0:07:48 41.3
0:07:53 41.3
0:07:58 40.0
0:08:03 41.8
0:08:08 40.9
0:08:13 38.3
0:08:18 40.5
0:08:23 38.7
0:08:28 39.6
0:08:33 38.7
0:08:38 40.5
0:08:43 40.0
0:08:48 39.2
0:08:53 39.6
0:08:58 40.9
0:09:03 39.6
0:09:08 39.6
0:09:13 40.0
0:09:18 39.6
0:09:23 41.8
0:09:28 41.3
0:09:33 41.3
0:09:38 40.5
0:09:43 42.2
0:09:48 41.3
0:09:53 42.6
0:09:58 42.6
0:10:03 44.4
0:10:08 41.3
0:10:13 42.6
0:10:18 40.9
0:10:23 44.4
0:10:28 41.3
0:10:33 43.9
0:10:38 43.1
0:10:43 44.8
0:10:48 43.9
0:10:53 44.4
0:10:58 42.2
0:11:03 41.8
0:11:08 44.8
0:11:13 44.4
0:11:18 44.8
0:11:23 46.1
0:11:28 45.3
0:11:33 43.9
0:11:38 46.1
0:11:43 42.2
0:11:48 43.1
0:11:53 46.1
0:11:58 43.9
0:12:03 45.3
0:12:07 47.0
0:12:12 44.8
0:12:17 47.9
0:12:22 45.3
0:12:27 45.7
0:12:32 46.6
0:12:37 45.3
0:12:42 45.7
0:12:47 46.6
0:12:52 46.1
0:12:57 45.3
0:13:02 46.6
0:13:07 46.1
0:13:12 46.6
0:13:17 48.3
0:13:22 47.4
0:13:27 49.2
0:13:32 46.6
0:13:37 45.3
0:13:42 48.7
0:13:47 47.9
0:13:52 48.3
0:13:57 49.6
0:14:02 49.2
0:14:07 46.6
0:14:12 47.4
0:14:17 48.3
0:14:22 47.4
0:14:27 47.4
0:14:32 49.2
0:14:37 50.5
0:14:42 49.6
0:14:47 49.2
0:14:52 48.7
0:14:57 48.7
0:15:02 50.9
0:15:07 48.3
0:15:12 51.3
0:15:17 49.6
0:15:22 48.3
0:15:27 49.2
0:15:32 53.5
0:15:37 50.5
0:15:42 51.3
0:15:47 50.0
0:15:52 50.9
0:15:57 50.9
0:16:02 50.0
0:16:07 50.5
0:16:12 53.1
0:16:17 52.6
0:16:22 49.2
0:16:27 49.6
0:16:32 51.3
0:16:37 51.3
0:16:42 51.8
0:16:47 50.5
0:16:52 51.8
0:16:57 53.1
0:17:02 52.6
0:17:07 51.8
0:17:12 52.2
0:17:17 53.1
0:17:22 51.3
0:17:27 50.9
0:17:32 51.8
0:17:37 51.8
0:17:42 52.2
0:17:47 51.3
0:17:52 53.5
0:17:57 52.6
0:18:02 52.2
0:18:06 51.3
0:18:11 50.9
0:18:16 50.0
0:18:21 51.8
0:18:26 51.8
0:18:31 53.1
0:18:36 52.2
0:18:41 52.6
0:18:46 54.0
0:18:51 53.5
0:18:56 54.0
0:19:01 51.3
0:19:06 52.6
0:19:11 52.6
0:19:16 54.8
0:19:21 51.8
0:19:26 55.3
0:19:31 53.1
0:19:36 53.5
0:19:41 52.2
0:19:46 52.6
0:19:51 53.5
0:19:56 53.1
0:20:01 55.3
0:20:06 51.3
0:20:11 55.3
0:20:16 52.6
0:20:21 54.0
0:20:26 54.4
0:20:31 58.3
0:20:36 55.3
0:20:41 54.0
0:20:46 53.5
0:20:51 54.8
0:20:56 53.5
0:21:01 55.3
0:21:06 54.0
0:21:11 54.0
0:21:16 53.1
0:21:21 54.0
0:21:26 54.4
0:21:31 53.5
0:21:36 52.2
0:21:41 54.4
0:21:46 54.4
0:21:51 54.4
0:21:56 54.4
0:22:01 55.3
0:22:06 53.1
0:22:11 54.8
0:22:16 55.7
0:22:21 54.8
0:22:26 50.9
0:22:31 54.4
0:22:36 54.0
0:22:41 54.0
0:22:46 52.2
0:22:51 54.8
0:22:56 54.8
0:23:01 54.4
0:23:06 56.1
0:23:11 56.1
0:23:16 52.6
0:23:21 55.7
0:23:26 53.1
0:23:31 54.4
0:23:36 55.7
0:23:41 55.7
0:23:46 56.1
0:23:51 54.0
0:23:56 54.4
0:24:01 54.0
0:24:06 53.5
0:24:10 53.5
0:24:15 50.9
0:24:20 51.8
0:24:25 51.8
0:24:30 55.7
0:24:35 50.5
0:24:40 51.3
0:24:45 51.8
0:24:50 50.9
0:24:55 47.0
0:25:00 46.6
0:25:05 44.8
0:25:10 50.5
0:25:15 46.1
0:25:20 46.6
0:25:25 45.3
0:25:30 42.6
0:25:35 44.8
0:25:40 45.7
0:25:45 47.0
0:25:50 46.6
0:25:55 45.7
0:26:00 44.4
0:26:05 44.4
0:26:10 47.9
0:26:15 44.4
0:26:20 47.0
0:26:25 43.9
0:26:30 43.1
0:26:35 41.8
0:26:40 44.4
0:26:45 42.2
0:26:50 45.3
0:26:55 41.3
0:27:00 43.5
0:27:05 37.0
0:27:10 43.1
0:27:15 39.2
0:27:20 38.3
0:27:25 39.6
0:27:30 40.0
0:27:35 38.3
0:27:40 40.9
0:27:45 40.5
0:27:50 38.7
0:27:55 40.0
0:28:00 40.9
0:28:05 41.3
0:28:10 39.2
0:28:15 40.9
0:28:20 38.3
0:28:25 40.0
0:28:30 40.0
0:28:35 40.5
0:28:40 39.6
0:28:45 40.0
0:28:50 40.9
0:28:55 37.9
0:29:00 38.7
0:29:05 40.0
0:29:10 39.6
0:29:15 40.0
0:29:20 39.6
0:29:25 40.0
0:29:30 40.0
0:29:35 40.5
0:29:40 40.0
0:29:45 39.2
0:29:50 42.2
0:29:55 39.6
0:30:00 38.3
0:30:05 39.2
0:30:09 40.5
0:30:14 38.3
0:30:19 40.5
0:30:24 39.2
0:30:29 40.0
0:30:34 40.5
0:30:39 42.2
0:30:44 40.5
0:30:49 40.0
0:30:54 40.5
0:30:59 39.6
0:31:04 39.2
0:31:09 42.2
0:31:14 40.5
0:31:19 40.5
0:31:24 38.7
0:31:29 40.0
0:31:34 38.7
0:31:39 40.0
0:31:44 38.7
0:31:49 37.9
0:31:54 40.0
0:31:59 40.5
0:32:04 38.7
0:32:09 40.9
0:32:14 39.2
0:32:19 39.6
0:32:24 38.7
0:32:29 41.3
0:32:34 39.6
0:32:39 40.0
0:32:44 39.2
0:32:49 38.3
0:32:54 37.9
0:32:59 40.9
0:33:04 39.6
0:33:09 38.7
0:33:14 41.3
0:33:19 40.5
0:33:24 39.6
0:33:29 38.3
0:33:34 40.0
0:33:39 37.9
0:33:44 41.8
0:33:49 38.7
0:33:54 39.2
0:33:59 40.0
0:34:04 39.6
0:34:09 38.3
0:34:14 41.3
0:34:19 39.2
0:34:24 39.2
0:34:29 41.3
0:34:34 38.3
0:34:39 39.6
0:34:44 39.6
0:34:49 40.5
0:34:54 40.0
0:34:59 40.9
0:35:04 40.0
0:35:09 40.9
0:35:14 40.9
0:35:19 39.6
0:35:24 39.2
0:35:29 38.3
0:35:34 38.7
0:35:39 40.0
0:35:44 38.3
0:35:49 38.7
0:35:54 38.7
0:35:59 40.5
0:36:04 40.5
0:36:09 41.3
0:36:13 40.9
0:36:18 38.7
0:36:23 40.5
0:36:28 39.6
0:36:33 40.5
0:36:38 41.3
0:36:43 39.6
0:36:48 39.6
0:36:53 38.7
0:36:58 39.6
0:37:03 38.3
0:37:08 39.6
0:37:13 37.9
0:37:18 39.6
0:37:23 39.6
0:37:28 40.0
0:37:33 39.2
0:37:38 40.9
0:37:43 38.7
0:37:48 38.7
0:37:53 39.6
0:37:58 40.5
0:38:03 40.5
0:38:08 38.3
0:38:13 40.0
0:38:18 38.3
0:38:23 39.2
0:38:28 40.9
0:38:33 39.2
0:38:38 41.3
0:38:43 40.0
0:38:48 39.6
0:38:53 39.2
0:38:58 37.9
0:39:03 39.2
0:39:08 40.9
0:39:13 38.7
0:39:18 40.9
0:39:23 39.2
0:39:28 40.5
0:39:33 38.3
0:39:38 39.6
0:39:43 40.5
0:39:48 40.9
0:39:53 40.0
0:39:58 38.3
0:40:03 37.4
0:40:08 40.0
0:40:13 40.5
0:40:18 40.0
0:40:23 39.6
0:40:28 43.5
0:40:33 40.9
0:40:38 40.9
0:40:43 40.9
0:40:48 39.6
0:40:53 39.2
0:40:58 39.2
0:41:03 39.6
0:41:08 38.3
0:41:13 40.0
0:41:18 38.7
0:41:23 39.6
0:41:28 38.7
0:41:33 40.5
0:41:38 39.6
0:41:43 40.0
0:41:48 40.5
0:41:53 39.6
0:41:58 39.2
0:42:03 40.0
0:42:08 41.3
0:42:12 41.3
0:42:17 38.7
0:42:22 39.6
0:42:27 39.6
0:42:32 41.3
0:42:37 38.3
0:42:42 38.7
0:42:47 40.0
0:42:52 39.6
0:42:57 40.9
0:43:02 39.2
0:43:07 38.7
0:43:12 39.2
0:43:17 38.7
0:43:22 38.7
0:43:27 40.9
0:43:32 40.0
0:43:37 35.7
0:43:42 40.5
0:43:47 38.3
0:43:52 40.0
0:43:57 40.9
0:44:02 39.2
0:44:07 39.2
0:44:12 39.2
0:44:17 40.9
0:44:22 39.6
0:44:27 40.5
0:44:32 39.2
0:44:37 40.9
0:44:42 40.5
0:44:47 38.7
0:44:52 38.7
0:44:57 38.7
0:45:02 39.2
0:45:07 40.0
0:45:12 41.3
0:45:17 40.5
0:45:22 39.2
0:45:27 40.0
0:45:32 38.7
0:45:37 41.3
0:45:42 39.2
0:45:47 40.5
0:45:52 40.0
0:45:57 41.3
0:46:02 40.9
0:46:07 41.3
0:46:12 38.7
0:46:17 40.0
0:46:22 41.3
0:46:27 39.6
0:46:32 39.6
0:46:37 37.9
0:46:42 40.0
0:46:47 40.0
0:46:52 39.2
0:46:57 39.2
0:47:02 39.6
0:47:07 38.7
0:47:12 40.0
0:47:17 39.2
0:47:22 39.2
0:47:27 40.0
0:47:32 40.0
0:47:37 40.9
0:47:42 38.3
0:47:47 41.3
0:47:52 37.9
0:47:57 38.7
0:48:02 41.8
0:48:07 38.7
0:48:12 39.2
0:48:16 41.3
0:48:21 38.7
0:48:26 39.6
0:48:31 40.5
0:48:36 40.5
0:48:41 39.2
0:48:46 38.7
0:48:51 39.6
0:48:56 40.5
0:49:01 39.2
0:49:06 39.2
0:49:11 39.6
0:49:16 40.9
0:49:21 41.8
0:49:26 40.5
0:49:31 41.3
0:49:36 41.8
0:49:41 39.6
0:49:46 38.7
0:49:51 37.9
0:49:56 39.2
0:50:01 40.9
0:50:06 38.7
0:50:11 41.3
0:50:16 38.7

Title : View / Trip Log / Trip 22 / Plot / Fuel Pressure (psi) / End
Time
Rows : 1
Columns : 1
Column 01 : End Time []
1/21/2005 2:20 PM

[Steve W.]

Bad tank of gas with lot's of water/crud. It keeps plugging things up.

> History:
> Fuel pump quit working over new years. I replaced and it drove fine.
> I drove one 300 mile trip then another 300 miles of city driving with
> no problems.
>
> It got real cold (irrelevant?). I drove for 25 miles with no issues.
> I filled up with gas (irrelevant?) after work and drove 10 miles and
it
> started acting up.

Notice how it started right after you filled up?
Pump out the tank. Fill with known good fuel. Replace the fuel filter
again.
Brt the problem goes away.

--
Steve Williams
Near Cooperstown, New York

Pacifism - The theory that if they'd fed
Jeffrey Dahmer enough human flesh,
he'd have become a vegan.

<dave...@gmail.com> wrote in message
news:1107460924.6...@c13g2000cwb.googlegroups.com...

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[dave...@gmail.com]

I think that is what I will try now. I just replaced my exaust/convert
from the O2 sensor back and it did not help.

This is getting expensive :(

[dave...@gmail.com]

[Lawrence Glickman]

The only way I know of monitoring your fuel pressure "while you are
driving around" is to have somebody plugged into your OBDII connector
with a real-time scanner, OR, use a data logger ( e.g. Davis
DriveRight CarChip, or record on a portable PC with a program like
AutoTap ).

I find that static one-shot readings don't really tell the whole story
of what is going on, that is why I keep a data logger plugged into the
OBDII port all the time. At 5 second test sweeps, it monitors up to
25 continuous hours of running time. At 60 second intervals, 300
continuous hours of running time. I keep it at the 5 seconds sampling
frequency and can watch what is really going on during all kinds of
driving conditions.

I might pull it out ever 2 or 3 weeks and look at the graphs. If
everything looks OK, I clear the chip memory and plug it back in.
Even once a month would be OK, as I've never used more than 22% of the
memory although I take a _lot_ of short trips.

You can then discard the data, or save it to a file for future
reference. I call it my "flight recorder."

Lg

[TaskMule]

<dave...@gmail.com> wrote in message
news:1107634723....@o13g2000cwo.googlegroups.com...

> I think that is what I will try now. I just replaced my exaust/convert
> from the O2 sensor back and it did not help.
>
> This is getting expensive :(
>

Why would you do this? Did you confirm that the cat was blocked up,
or are you just throwing parts at it?

[Rich]

<dave...@gmail.com> wrote in message
news:1107634723....@o13g2000cwo.googlegroups.com...

> I think that is what I will try now. I just replaced my exaust/convert
> from the O2 sensor back and it did not help.
>
> This is getting expensive :(
>

Have you replaced the external fuel filter? First thing to replace and the
cheapest.

If not that I will suspect the filter or pump in the tank. A lot of labor
there emptying the tank.

[Lawrence Glickman]

No labor emptying tank. Use a siphon hose, and then to get the last
bits, run the engine until it stalls from no fuel. Depending on how
much fuel is in the tank now, just put it into a couple of large-sized
gasoline cans.

Lg

[Rich]

"Lawrence Glickman" <Lawrence...@comcast.net> wrote in message
news:r3ka01h74bfttobm2...@4ax.com...

Labor if you have it filled (27 Gallons) <Grin>

[Bob]

"Lawrence Glickman" <Lawrence...@comcast.net> wrote in message

news:jhba01lp3jaesvlej...@4ax.com...

> On 5 Feb 2005 12:18:43 -0800, dave...@gmail.com wrote:
>
>>I think that is what I will try now. I just replaced my exaust/convert
>>from the O2 sensor back and it did not help.
>>
>>This is getting expensive :(
>
> The only way I know of monitoring your fuel pressure "while you are
> driving around" is to have somebody plugged into your OBDII connector
> with a real-time scanner, OR, use a data logger ( e.g. Davis
> DriveRight CarChip, or record on a portable PC with a program like
> AutoTap ).

Nice guess Larry but since his PCM has absolutely no clue what the fuel
pressure is, your data logger won't work. It may be able to moniter several
things but fuel pressure isn't among them.
Bob

[Bob]

"Lawrence Glickman" <Lawrence...@comcast.net> wrote in message

news:r3ka01h74bfttobm2...@4ax.com...

Another nice try Larry, stick a siphon hose in your Taurus and let us know
how much luck you have siphoning the fuel out of it.
Bob

[TranSurgeon]

"Bob" <b...@n0spam.net> wrote in message
news:UmfNd.10168$ko1....@fe04.lga...

>
> "Lawrence Glickman" <Lawrence...@comcast.net> wrote in message
> news:jhba01lp3jaesvlej...@4ax.com...
> > On 5 Feb 2005 12:18:43 -0800, dave...@gmail.com wrote:
> >
> >>I think that is what I will try now. I just replaced my exaust/convert
> >>from the O2 sensor back and it did not help.
> >>
> >>This is getting expensive :(
> >
> > The only way I know of monitoring your fuel pressure "while you are
> > driving around" is to have somebody plugged into your OBDII connector
> > with a real-time scanner, OR, use a data logger ( e.g. Davis
> > DriveRight CarChip, or record on a portable PC with a program like
> > AutoTap ).
>
> Nice guess Larry but since his PCM has absolutely no clue what the fuel
> pressure is, your data logger won't work. It may be able to moniter
several
> things but fuel pressure isn't among them.
> Bob

not directly, but here's a thought:

I get a LOT of GM trucks with a 'no 4th gear' complaint

if you drive it just right, it WILL go into 4th............but the problem
is plugged fuel filter, thus more throttle pressure, thus ECM keeps it in
third

SO:

do what I do to demonstrate to the customer where the problem
is...............monitor O2 sensors + injector pulse width

if you see O2 going lean and at the same time the IPW is getting longer and
longer, you have a fuel delivery problem.............filter or pump

just a thought

G

[Bob]

"TranSurgeon" <nobul...@mchsi.dotcom> wrote in message
news:wwfNd.50961$EG1.30974@attbi_s53...

That's true enough Gary, but it still doesn't change the fact that Glickman
is full of shit.... yet again.... The PCM doesn't have a clue what the fuel
pressure is. It may think the engine is lean due to the feedback it gets
from the O2 sensors and increase the fuel trim to compensate. But it still
doesn't know if the problem is fuel pressure, a bad sensor, or something
else. It just knows it is having to add fuel to get an O2 response and will
set a code if it reaches a certain limit.
Bob

[TaskMule]

"Bob" <b...@n0spam.net> wrote in message

news:DxfNd.10170$ht1....@fe04.lga...

Actually if your removing the tank one of the first things you do is
disconnect the filler pipe. Then you siphon. It doesn't get any easier. As
for running the engine till the last bit is out, a total waste of time.

[ed]

I tell ya, go back over what you've already done.
You may have a bad part in the plenum area. Also, there is a strainer in
the tank with the fuel 'assembly'. Is that replaced? That fuel assembly
is best changed completely out and not piece-mealed.

[TranSurgeon]

"Bob" <b...@n0spam.net> wrote in message

news:Z9gNd.10174$OS1....@fe04.lga...

oh, I know

I just thought it might help somebody else.........some one who's not
suffering from 'cranio-rectitis'

[Bob]

"TaskMule" <unava...@thistime.net> wrote in message
news:xbydnUAnQYj...@magma.ca...

Who said anything about removing the tank? Hell, the whole idea that his
fuel is contaminated was just someone's brain fart. It's time he quits
throwing parts at it and listening to nitwits like glickman and starts doing
some diagnosing.
Bob

[TaskMule]

"Bob" <b...@n0spam.net> wrote in message news:JasNd.10237$o_....@fe04.lga...

>
> "TaskMule" <unava...@thistime.net> wrote in message
> news:xbydnUAnQYj...@magma.ca...

snip

> > Actually if your removing the tank one of the first things you do is
> > disconnect the filler pipe. Then you siphon. It doesn't get any easier.
As
> > for running the engine till the last bit is out, a total waste of time.
> >
>
> Who said anything about removing the tank? Hell, the whole idea that his
> fuel is contaminated was just someone's brain fart. It's time he quits
> throwing parts at it and listening to nitwits like glickman and starts
doing
> some diagnosing.
> Bob
>
>

I couldn't agree more

[Lawrence Glickman]

Foaming at the mouth again are we bobby socks?
Whatever you've got, keep it to yourself. There isn't a vaccine
presently on the market that could possibly deal with your disease.

I request to see your "credentials." Went to auto-shop at high school
perhaps? Lincoln Technical Institute, or maybe you're just a hack car
breaker who came up the hard way, breaking one car at a time along the
way.

I imagine your career has peaked, and you're never going anywhere
beyond where you are now, which is changing oil and topping up
radiators. Must suck to be you, but then, you get what you deserve.

Lg

>I couldn't agree more

Changes tune midstream.
Nitwits.
Monitoring fuel pressure is a non issue. It is easy to do. You all
try to make it sound like rocket science to boost your own egos, but
there are many amateurs that know the magic secrets you pretend to
have hoarded all to yourselves.

Lg

[Steve W.]

No problem to siphon the fuel out of a TRUCK. haven't seen one that has
anything to block the fill yet. Some AUTOS do have though.

--
Steve Williams

"Bob" <b...@n0spam.net> wrote in message

news:DxfNd.10170$ht1....@fe04.lga...

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[Bob]

"Lawrence Glickman" <Lawrence...@comcast.net> wrote in message

news:1vrc01pkuhigdad4r...@4ax.com...

> Foaming at the mouth again are we bobby socks?
> Whatever you've got, keep it to yourself. There isn't a vaccine
> presently on the market that could possibly deal with your disease.
>
> I request to see your "credentials." Went to auto-shop at high school
> perhaps? Lincoln Technical Institute, or maybe you're just a hack car
> breaker who came up the hard way, breaking one car at a time along the
> way.
>
> I imagine your career has peaked, and you're never going anywhere
> beyond where you are now, which is changing oil and topping up
> radiators. Must suck to be you, but then, you get what you deserve.
>
> Lg

Wrong on all counts numb nuts....

>>I couldn't agree more
>
> Changes tune midstream.
> Nitwits.
> Monitoring fuel pressure is a non issue. It is easy to do. You all
> try to make it sound like rocket science to boost your own egos, but
> there are many amateurs that know the magic secrets you pretend to
> have hoarded all to yourselves.

For once Larry you are right........ there ARE amateurs that know a lot
about auto repair, you just aren't one of them. You are just here wasting
peoples time and resources with your useless suggestions.
Bob

[Lawrence Glickman]

It is inescapable to the casual observer, that you NEVER ANSWER ANY
QUESTIONS, but rather just spew vitriolic.

I asked you for Credentials, evidently you have none to present.

Nuff said.

Lg

[Bob]

"Lawrence Glickman" <Lawrence...@comcast.net> wrote in message

news:47ed01dtnpod9k572...@4ax.com...

>>For once Larry you are right........ there ARE amateurs that know a lot
>>about auto repair, you just aren't one of them. You are just here wasting
>>peoples time and resources with your useless suggestions.
>> Bob
>>
>
> It is inescapable to the casual observer, that you NEVER ANSWER ANY
> QUESTIONS, but rather just spew vitriolic.
>
> I asked you for Credentials, evidently you have none to present.
>
> Nuff said.
>
> Lg
>

You said you could get fuel pressure readings from the data stream of a 95
Astro, and you have the nerve to ask ME for credentials? You're the one
doing all the spewing.... all I did was point that fact out. Why don't you
go ahead and explain just how you can get fuel pressure readings from the
data stream..........
Bob

[Lawrence Glickman]

[Bob]

"Lawrence Glickman" <Lawrence...@comcast.net> wrote in message

news:1vrc01pkuhigdad4r...@4ax.com...

> I imagine your career has peaked, and you're never going anywhere
> beyond where you are now, which is changing oil and topping up
> radiators. Must suck to be you, but then, you get what you deserve.
>
> Lg

Well gee Larry, the only road to my shop was closed for two months last
summer. While there was access to my shop through a park many customers had
a hard time finding me, taking a short cut through the park or across
neighboring lawns. One week after the road reopened we were hit with the
worst flood in this towns history (8ft deep in my shop). In spite of all
that last year was my best ever. You want credentials? I could type a long
list of them but what would be the point? The only thing that really matters
is that my customers are happy and keep coming back. By the way I rarely
work on cars any more, I have employees for that. Things are damn good and
only getting better. I get paid for repairing cars, pointing out your
stupidity I consider a public service. Of coarse if you were to quit
flapping your gums when you don't know what you're talking about my service
wouldn't be needed any more.
Bob

[Lawrence Glickman]

So you feel it is necessary to point out other people's stupidity to
them, then you are going to be a VERY BUSY person. In fact, forget
about taking time out to sleep or eat !

Lg

[dave...@gmail.com]

I just test drove the van with the fuel gauge hooked up and the needle
swept between 50psi and 70psi when I accelerated. The pressure never
dropped below 50psi even while the van was running poorly.

I also drained the gas and re-changed the fuel filter and it did not
help.

I will try and better explain how it is acting.

The van always starts and runs fine.
It drives fine for a short distance then starts to run very bad,
sometimes backfires, stalls, and completely dies.

It takes as much as 10 to 15 minutes of regular city driving to cause
these symptoms or 2-3 minutes of driving under a load (when I hot rod
it).

If the van completely dies, I can turn it off for 10 seconds then right
back on and I can usually baby it home (1-2 miles). If I leave it off
for 15 minutes it usually runs quite a bit better.

I have replaced:
Leaky CPI (spider)
Inlet outlet fuel lines (nut kit)
Fuel Filter
Fuel Pump and strainer
Exhaust from O2 sensor back (waste of $$$... my dumb fault)
Drained the gas

Is it time to take it to a mechanic? I am out of ideas and do not know
what else to check. Is there a certain test that a shop could perform
that would tell me what is wrong such as a general diagnostic or run it
on a computer?

Does this still sound like a fuel delivery problem?

[TranSurgeon]

take off the goddam EGR valve and make a plate to cover the opening, and
re-test it

or take off the EGR, make sure it's fully closed, put it back on but DON'T
hook it up, and go for a drive

if your brake pedal gets 'hard to push' when this happens, it's the EGR
hanging open

<dave...@gmail.com> wrote in message
news:1107794161.0...@o13g2000cwo.googlegroups.com...

[Rich]

<dave...@gmail.com> wrote in message
news:1107794161.0...@o13g2000cwo.googlegroups.com...

No it doesn't. Usually if you have a fuel problem the engine runs better,
if anything, as the engine warms up. Initial pressure, key on, should be
60 - 65 psi

[Steve W.]

Well you eliminated fuel problems. You say it only happens when the
engine gets warm? Go to a local electronics place and get a can of
"component cooler" (basically R-134A) Run the vehicle till it starts to
act up. Then pop the hood and spray ONE sensor/part at a time. I would
start with the ignition coil, then the base of the distributor. Then
work your way around the engine compartment. After you spray a part run
it some, when you find the bad part it should become obvious since the
problem should go away. I would almost guess the coil is breaking down
when it gets hot, but there are a LOT of sensors that can be affected by
heat.

--
Steve

<dave...@gmail.com> wrote in message
news:1107794161.0...@o13g2000cwo.googlegroups.com...

----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----

[Whitelightning]

<dave...@gmail.com> wrote in message
news:1107794161.0...@o13g2000cwo.googlegroups.com...

I am going out on a limb here and make a guess, actually a couple. One this
thing has a distributor. And as such it has a pick up coil, a magnet, and a
module. I would want a good scope put on the rig and watch the wave
patterns on the pick-up coil. while some of it sounds fuel related, the
back fire doesn't. I have ran into the same general symptoms you describe
in the past, except the time to restart was usually longer, but then by the
time I got them they were pretty much undrivable they had gotten so bad..
At 105,000 miles the bushings in the distributor are probably worn as well.
But I wouldn't change unless you can get a scope to verify which means
getting it to act up while its hooked up.
Whitelightning

[dave...@gmail.com]

I took off EGR valve made sure it was closed then reinstalled without
the plug. It did not help.

One more thing I just noticed. When the van is not acting up and I
turn it on then back off it will hold 25lbs of fuel pressure.

When it is acting up and I turn it off it will not hold any fuel
pressure. Even if I leave it off for a couple minutes it still will
not hold fuel pressure.

After an extended period of time (hours or overnight) it will again
hold 25lbs of fuel pressure when the key is off.

Also, I misspoke earlier. It is not backfiring it is popping back at
the engine. I am not sure what you call that. Sorry for the confusion.

btw, I just rented (deposit/free) an Actron Super AutoScanner. I will
read the manual today and post whatever data I can get out of it
tonight.

Thanks for the suggestions,

[dave...@gmail.com]

Summarizing

Fuel/Ignition/Other? Please help

I have been trying to figure this out with no success. Can you guys
take a look and offer any suggestions you might have?

Vehicle:
1995 CHEVROLET TRUCK ASTRO VAN
2WD Automatic Transmission
6 Cylinders 4.3L CPI
105,000 miles

Symptoms:
The van always starts and runs fine for at least a minute or two.
However after a short distance it will not accelerate properly and it
will try to stall. As it progresses I might get some popping at the
engine and eventually it will die. When I press the accelerator it
acts like it wants to die.

It takes as much as 10 to 15 minutes of regular city driving to cause

these symptoms or 2-3 minutes of driving under a load (when I hot-rod
it). It does not seem to be directly related to engine temperature.

If the van completely dies, I can turn it off for 10 seconds then right

back on and it definitely drives better (not completely normal). If I
leave it off for 15 minutes it usually runs quite a bit better.
Overnight and it runs normal when I first start it.

Parts Replaced:

Leaky CPI (spider)
Inlet outlet fuel lines (nut kit)
Fuel Filter
Fuel Pump and strainer
Exhaust from O2 sensor back

Drained the gas
Ignition coil
PCV Valve
Tune up (plugs,wires,cap,rotor)(6 months ago)
Oxygen sensor (6 months ago)

Current Diagnostic (I am a complete armature so some/all items could be
irrelevant)

EGR (sticking)
Tapping/ticking started after I removed/checked this. I am pretty sure
I just need to take it off again and clean or replace. I do not
believe this is my main problem because I took it off, closed the
valve, and reinstalled without hooking it up. This test did not change
any of the symptoms listed above.

Distributor
I just examined the distributor and one of the plug wires and probes on
the distributor was severely corroded; the rest were fine. I will get
a new cap and wire tonight and check the plug.

Fuel Pressure
Test with a fuel pressure gauge. After sitting overnight, turn key on
and I get 62psi pressure (in spec). Turn key off and it holds 25psi
pressure (there is no spec that I know of for this).
While running it never drops below 50psi (in spec) even when it is
acting up. While it is acting up and I accelerate the needle will
sweep between 50psi to 70psi very fast.
What concerns me is that after it is acting up and I turn the key off
the fuel pressure instantly DROPS to 0psi. It this an issue?
If I let the van sit for two minutes and turn the key on (pump on) then
back off again it will still drop to 0psi. If I let it sit overnight
it will again hold 25psi of pressure with the key off.

Codes
The check engine light (service engine soon) does work, but does NOT
turn on. I do not get any codes. To verify I rented an "Actron
Super AutoScanner" and checked the codes. I do not get any.

I know I can monitor real time data with this device (scanner) but I do
not know what to look for (suggestions?).

Do you guys have any suggestions on what to try next? I am about out
of ideas and I am thinking about taking it to the shop. If/when I take
it in, do you have and advice on what type of shop or diagnostic test I
should ask them to run (or not to run)?

[Steve W.]

An engine needs thre things to run
Air, Fuel, Ignition source
Air is a given unless your covering the air cleaner with a bag.
Fuel - about the only thing you didn't replace was the tank, so I would
say your OK there

The symptoms point to a heat related failure. Some component is getting
hot enough to shut down the engine.
Since you still have fuel pressure when the engine dies it isn't a bad
pump.
It also isn't likely the EGR since they don't normally shut down an
engine and then clear up when they get cool. They are either stuck open
(which causes REAL bad idle on the 4.3 and an engine that will not idle
hot or cold) or they don't work at all.

Ignition?
You said you found a cruddy wire end. One usually won't do much but
cause missfiring in that cylinder. I has a problem with the wifes 94 4.3
that was a bad set of plug wires. It caused massive missfiring but no
real problem with running or acceleration. Just bucking under load.
(common symptom FYI).

Bad plugs- Not likely since they fire OK when cold. Plus for the engine
to quit they all have to stop working.

Plug wires- Same as above BUT they could cause crossfiring.

Cap - Usually causes missfires if the cap is bad.

Rotor - possible but not real likely.

Coil- very possible- it could be shorting out internally when it gets
warm enough.

Ignition Module - possible for the above reason, but they usually just
fail.

Computer - It's not showing codes which is not unusual for an OBD I.5
vehicle (oddball that GM used in 95 on some vehicles) they mainly show a
code only when an item totally fails, unlike OBD II that can tell you
that a sensor is just getting weak. It could have a bad connection on
the main connection though.

Main wiring harness connection on the firewall - It has been a culprit a
few times for heat related problems. It gets warm and the connection
opens.

It is also possible that it could be a bad connection to one of the
above components.

--
Steve Williams

<dave...@gmail.com> wrote in message
news:1107970719.8...@o13g2000cwo.googlegroups.com...

[ed]

I think I'd elmintae fuel entirely for the most part and at least slap a
gauge on that fuel pressure. Run it and shut it off see if it holds
pressure. See what the presure is when it stops running for the hell of it.

Sure the EGR is carboned up inside?(it should be getting close by now).

[Murray]

On 9 Feb 2005 09:38:39 -0800, dave...@gmail.com wrote:

>Summarizing
>
>Fuel/Ignition/Other? Please help

<snipped>

>Fuel Pressure
>Test with a fuel pressure gauge. After sitting overnight, turn key on
>and I get 62psi pressure (in spec). Turn key off and it holds 25psi
>pressure (there is no spec that I know of for this).
>While running it never drops below 50psi (in spec) even when it is
>acting up. While it is acting up and I accelerate the needle will
>sweep between 50psi to 70psi very fast.
>What concerns me is that after it is acting up and I turn the key off
>the fuel pressure instantly DROPS to 0psi. It this an issue?
>If I let the van sit for two minutes and turn the key on (pump on) then
>back off again it will still drop to 0psi. If I let it sit overnight
>it will again hold 25psi of pressure with the key off.

This makes it sound like an injector problem to me. The only way it
can bleed off the pressure is to leak somewhere.

Have someone turn the key while you look into the throttle body for
gas pouring into the manifold. (it is throttle body design, not
multi-port right?).

Just a guess but easy to test for.

Good luck,

Murray

[46...@mydeja.com]

On 3 Feb 2005 12:02:04 -0800, dave...@gmail.com wrote:

>Can someone please help me figure this out? I am really stuck.
>
>I have a 1995 CHEVROLET TRUCK ASTRO VAN 2WD
>6 Cylinders 262 W 4.3L CPI. 105,000 miles
>
>
>
>Symptoms:
>The van is cutting out like it is running out of fuel while driving.
>
>I let the van warm up first before a test drive. It drives okay (not
>great) at first, then it starts acting like it is running out of gas.
>It bogs down and stalls when I accelerate. I tried flooring it and it
>wants to die. This problem is progressive meaning it is getting worse;
>now it happens after just a couple miles of driving. The problem will
>go away (van drives much better) after turning off the van and then
>back on.
>
>
>History:
>Fuel pump quit working over new years. I replaced and it drove fine.
>I drove one 300 mile trip then another 300 miles of city driving with
>no problems.
>
>It got real cold (irrelevant?). I drove for 25 miles with no issues.
>I filled up with gas (irrelevant?) after work and drove 10 miles and it
>started acting up.
>
>The problem got worse over the next couple days (60 miles city
>driving).
>
>I changed the fuel filter which was clogged and appeared to be the
>original filter. It seemed to run fine. I drove several very short
>trips 5 miles which may have been too short to notice symptoms. I
>filled up again, then drove 15 miles.
>
>It acted worse than ever.
>
>I checked the fuel pressure. It was about 62psi with the pump running
>but dropped to 6psi when not running.
>
>I replaced the CPI unit and the nut kit (fuel lines). The fuel
>regulator was leaking. I could see where the gas had cleaned the
>inside of the plenum.
>
>I retested fuel pressure. It was 62psi with the pump running but
>dropped to 22psi with the pump off. My Haynes manual said it should
>only drop 3-10psi with the key off.
>
>I road tested the van and it has the same symptoms.
>
>Shouldn't I be able to see or smell the gas that bleeds off? I
>don't see any gas (I will double check tonight).
>
>Now I do not know what to do. I am stuck. Can anyone offer any
>suggestion?

Did you get the issue settled? Sounds like what happened to my 1988 Olds
wagon. Rodent had chewed at the main wire harness under the car. It
eventually caught on fire. Fire was put out. Harness replaced,ran fine. I
guess some bare wires were touching the frame at times and really screwing
up the main computer. Giving me all kinds of weird stalling.

[Sam]

May sound silly, but when was your last tune up? I spent hour after hour
looking for a difficult answer for the crappy running motor. Turned out, I
replaced the rotor, cap, wires & plugs......never better

Good luck

<46...@mydeja.com> wrote in message
news:q538115p900553vib...@4ax.com...

[Jessie Herrera]

Hi,
I'm assuming you have fuel injection. Your pump should pump around 35
psi. You can put a pressure gauge on your fuel line and check the
pressure. First though, I would suspect a dirty fuel filter. Sometimes
fuel injected vehicles have 2 in line filters. when one plugs up it can
cause your problem. It can also be your fuel regulator.
Good luck to you.
Jessie

[dave...@gmail.com]

I finally got it fixed. I suspect it was the pulsator.
I ended up dropping the tank and replacing the pump, threw out the
pulsator and replaced with fuel line, replaced the main gasket and a
missing o-ring on one of the fuel lines to the tank. I am not sure if
the o-ring was lost when I dropped the tank or some other time.

It runs great now. Thank you guys so much for all you help and
suggestions!!!!!

[Drewsky]

replying to daveg.01, Drewsky wrote:
I have the same problem with my van same model w vin. Did you ever find the
problem?

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[bwc...@gmail.com]

See if it is showing any codes, get an ODB II checker at auto supply that plugs into a socket under the steering wheel. Zero fuel pressure is one thing, but there are many sensors that cause problems with computer adjusting fuel output. On my 2.8 93 Sonoma I have had problems with temperature sensors causing similar problem, another one is throttle position sensor, but try first to see if computer can send code that you look up in book to see what's it thinks is wrong.

[Edog]

My 95 Astro Van is down It's been sitting for a long time I was using it to drag the road (Dirt) it started dying like it was a fuel filter, So i replaced it, it did same, I did get it to run enough to move it, so it blocked my neighbours view, of my hot tub, it set for a while The a fried with an S-10 told me his did same, and it was the fuel pump, So I replaced it, still not running I pulled the top of the plenum off and checked the injector it seemed fine The I got a pressure setup it goes to 60 psi pump goes off and pressure droppd to 40 psi then slowly down to 30 psi, and a very slow drop to 20

--
For full context, visit https://www.motorsforum.com/chevy_trucks/fuel-pressure-issue-95-astro-please-help-35769-.htm

[helper]

Fuel pressure is lower on a fuel injection car than with carburetor I read once. With my 93 Sonoma, past problems were most often with sensors in the fuel injection and smog system. I have in the past replaced the fuel pump in the tank (did so by raising truck bed to gain access), but first better to invest in a code checker, auto suppliers have them for around $25. Sensors regulate fuel, it could be throttle position sensor, or temperature sensor (when cold it tells computer to use more fuel for same rpm). Under the dash is a socket, you plug in the checker, it begins flashing a code with a light in the instrument area. There are 6 to 8 sensors. Look up in a repair manual of that car, and it will tell you how it is done and show the code meanings for you to localize what the problem is before spending too much.

[Xeno]

On 3/1/2024 12:00 pm, helper wrote:
> Fuel pressure is lower on a fuel injection car than with carburetor I

This first sentence is total bullshit so ...

<snip the rest>

--
Xeno


Nothing astonishes Noddy so much as common sense and plain dealing.
(with apologies to Ralph Waldo Emerson)