Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
repl lift pump on 96 cummins RAM pickup with electric one
148 views
Skip to first unread message
desperado
Aug 27, 2009, 6:47:41 PM8/27/09
to
My lift pump failed on my 1996 Dodge Ram 2500 4wd with the 12 valve Cummins.
I want to substitute an electric lift pump. Although easy to install after
the fuel strainer/heater by splicing into the rubber hose, I don't want to
pump through the old one as the diaphragms might fail and contaminate the
oil with diesel.(oil is not contaminated)
The fittings on the output of the mechanical pump look kind of funny and
non standard. Looks like a bushing out of pump and then some kind of
connector to the fuel/water separator. The original mechanical pump specs
say 25psi is put out; not sure what would the low end be if I get a
substitute electric pump.
Any comments on how best to hook into the fuel water separator or the
electric lift pump in general used with this truck?
I want to substitute an electric lift pump. Although easy to install after
the fuel strainer/heater by splicing into the rubber hose, I don't want to
pump through the old one as the diaphragms might fail and contaminate the
oil with diesel.(oil is not contaminated)
The fittings on the output of the mechanical pump look kind of funny and
non standard. Looks like a bushing out of pump and then some kind of
connector to the fuel/water separator. The original mechanical pump specs
say 25psi is put out; not sure what would the low end be if I get a
substitute electric pump.
Any comments on how best to hook into the fuel water separator or the
electric lift pump in general used with this truck?
--
don paolino
desperado
Aug 28, 2009, 1:39:05 AM8/28/09
to
more on first post.
as a ps to my initial post, I forgot to ask if anyone knows if I did any
damage to the main P7100 injection pump by cranking so much. It took me a
while to do the testing to figure out the lift pump had failed.
I see there are very expensive aftermarket kits with there own heaters and
fuel filters that will go directly between tank and high press pump.
I would like to use the stock heater and fuel water separators and bypass
the mechanical pump with an electric one. Not sure of the specs but I would
think 100gph at about 15psi would work. I want to plumb a fuel gauge onto
this setup too. I am not sure what kind of fitting comes out of the
mechanical pump, whether pipe, or o ring boss or flare. that is my big
problem right now until I can take the old pump off.
as a ps to my initial post, I forgot to ask if anyone knows if I did any
damage to the main P7100 injection pump by cranking so much. It took me a
while to do the testing to figure out the lift pump had failed.
I see there are very expensive aftermarket kits with there own heaters and
fuel filters that will go directly between tank and high press pump.
I would like to use the stock heater and fuel water separators and bypass
the mechanical pump with an electric one. Not sure of the specs but I would
think 100gph at about 15psi would work. I want to plumb a fuel gauge onto
this setup too. I am not sure what kind of fitting comes out of the
mechanical pump, whether pipe, or o ring boss or flare. that is my big
problem right now until I can take the old pump off.
--
don paolino
"desperado" <desper...@yahoo.com> wrote in message
news:famdnb7ES5k_kQrX...@iwvisp.com...
Steve
Aug 28, 2009, 11:56:45 AM8/28/09
to
I don't know the specifics of the 96 Cummins/Ram installation, but
electric lift pumps are pretty common on other diesels and I have
heard/read about plenty of people converting Rams to electric lift
pumps. 100 GPH seems like massive overkill to me- you probably only need
about 15-20 GPH unless this a super-boosted over-fuelled smoke-belchin'
pullin' truck.
electric lift pumps are pretty common on other diesels and I have
heard/read about plenty of people converting Rams to electric lift
pumps. 100 GPH seems like massive overkill to me- you probably only need
about 15-20 GPH unless this a super-boosted over-fuelled smoke-belchin'
pullin' truck.
Maybe one of these would work:
http://www.yachtsupplydepot.com/mechanical-supplies/fuel-pumps/cat_697.html
I'd also poke around some of the diesel forums to see what others
recommend. TDR used to be a great resource, haven't looked around there
in years, though. You probably have to join to use the "search"
function, but IMO a good forum is well worth it.
http://www.turbodieselregister.com/forums/
desperado
Aug 29, 2009, 1:47:03 AM8/29/09
to
thks for the reply Steve. You are right on the gph. The truck is just a
regular old stock daily driver and the manual I have says while cranking,
you should get about 1 liter per minute out of the pump which is about
15gph. excess fuel is returned by a line on the filter canister back to the
tank.
Looks like a lot of pumps to choose from on that website.
It sounds like a simple job, but sometimes the simple ones can come back
to bite, like I am not sure about check valves in the pump as there are 3 in
the mech one; don't want the fuel to siphon back into the tank so I might
have to add my own check valve.
The truck ran fine when I parked it to change the fuel filter. the only
thing I noticed in last couple of years was a slight decrease in mileage. I
am sure the lift pump was bad and the main P7100 IP was pulling fuel through
its internal pump. Fortunately, this model pump is lubricated by fuel oil
from the engine; I heard the later pumps were lubed by fuel oil and failed
shortly after lift pump failed.
regular old stock daily driver and the manual I have says while cranking,
you should get about 1 liter per minute out of the pump which is about
15gph. excess fuel is returned by a line on the filter canister back to the
tank.
Looks like a lot of pumps to choose from on that website.
It sounds like a simple job, but sometimes the simple ones can come back
to bite, like I am not sure about check valves in the pump as there are 3 in
the mech one; don't want the fuel to siphon back into the tank so I might
have to add my own check valve.
The truck ran fine when I parked it to change the fuel filter. the only
thing I noticed in last couple of years was a slight decrease in mileage. I
am sure the lift pump was bad and the main P7100 IP was pulling fuel through
its internal pump. Fortunately, this model pump is lubricated by fuel oil
from the engine; I heard the later pumps were lubed by fuel oil and failed
shortly after lift pump failed.
--
don paolino
"Steve" <n...@spam.thanks> wrote in message
news:Qd-dnc4ZnMWjYwrX...@texas.net...
0 new messages