Primer bulb primer.
Dave Brown
doesn't stay hard even thought their next door neighbor says it should so here's
my attempt at turning the tide:
The primer bulb on *any* brand of outboard motor contains two one way valves.
When you squeeze the bulb, the inlet valve closes and the outlet valve opens
forcing the gas that's in the bulb to be pushed towards the engine (there's
usually an arrow on the bulb showing flow direction). When the bulb is released,
a low pressure is created inside the bulb thus closing the outlet valve and
opening the inlet valve which draws fuel from the tank to replenish the bulb.
Repeat this process and eventually, the engine will be full of fuel and will
resist any further attempts to continue. At this point, pressure rises in the
bulb and it gets hard (sound familiar? <g>). When the engine is started and
begins to consume fuel, the engine fuel pump will create a low pressure inside
the fuel line and primer bulb causing *both* valves to open thus allow fuel to
free flow through the bulb. The result? A soft bulb after every use of the
motor. Are we clear on this?
Hands up, how many thought otherwise?
Got a bulb that won't get hard? Point the arrow skywards as gravity will greatly
improve the efficiency of the valves.
Everyone go squeeze their bulbs and let me know how you made out...... ;-)
--
Regards,
Dave Brown
Brown's Marina
http://www.brownsmarina.on.ca/
SoccerChSC
>Got a bulb that won't get hard? Point the arrow skywards as gravity will
>greatly
>improve the efficiency of the valves.
>
>Everyone go squeeze their bulbs and let me know how you made out...... ;-)
>
>--
>Regards,
>
>
Hahahaha!
Sounds like a Bobbick Bulb(sp?), Only he has a relief valve!!! Dave... What
happens if the valve gets clogged? Does he call Monica and order cigars?
Hahahahahaha! ROFPMP!
Larry W4CSC
<da...@brownsmarina.on.ca> wrote:
>
>Everyone go squeeze their bulbs and let me know how you made out...... ;-)
>
>--
>Regards,
>
> Dave Brown
> Brown's Marina
> http://www.brownsmarina.on.ca/
Mine stayed hard until I got to be about 42.....I think it needs its
"valves" worked on, now.....(c;
larry
Larry W4CSC
pointing towards the tank, raise your hand......I know of TWO...NO,
not mine!
larry
On 16 Jul 2000 04:40:52 GMT, socce...@aol.com (SoccerChSC) wrote:
>>
>>Got a bulb that won't get hard? Point the arrow skywards as gravity will
>>greatly
>>improve the efficiency of the valves.
>>
>>Everyone go squeeze their bulbs and let me know how you made out...... ;-)
>>
>>--
>>Regards,
>>
>>
>
Jim Burmeister
Caused the engine to quit while running slow trolling. I called the factory as the dealer had no good clue.
Merc warranty replaced the bulb with one that now has a yellow ring on the upward end........
all runs fine now.......
They said they had many many bad bulbs where the valves were getting gummy and sticking
shut when the engine was run slow for a period of time.
One Merc dealer said they have been replacing them as standard procedure on ALL
engines that have bulbs with out the yellow ring on the Up arrow end.
anyway the comment is the bulb was not only soft but dry as no fuel was able to pass through it.
.........Jim
"Dave Brown" <da...@brownsmarina.on.ca> wrote in message news:39712973...@brownsmarina.on.ca...
> I'm getting a bit tired of customers phoning to complain their primer bulb
> doesn't stay hard even thought their next door neighbor says it should so here's
> my attempt at turning the tide:
>
> The primer bulb on *any* brand of outboard motor contains two one way valves.
> When you squeeze the bulb, the inlet valve closes and the outlet valve opens
> forcing the gas that's in the bulb to be pushed towards the engine (there's
> usually an arrow on the bulb showing flow direction). When the bulb is released,
> a low pressure is created inside the bulb thus closing the outlet valve and
> opening the inlet valve which draws fuel from the tank to replenish the bulb.
> Repeat this process and eventually, the engine will be full of fuel and will
> resist any further attempts to continue. At this point, pressure rises in the
> bulb and it gets hard (sound familiar? <g>). When the engine is started and
> begins to consume fuel, the engine fuel pump will create a low pressure inside
> the fuel line and primer bulb causing *both* valves to open thus allow fuel to
> free flow through the bulb. The result? A soft bulb after every use of the
> motor. Are we clear on this?
>
> Hands up, how many thought otherwise?
>
> Got a bulb that won't get hard? Point the arrow skywards as gravity will greatly
> improve the efficiency of the valves.
>
> Everyone go squeeze their bulbs and let me know how you made out...... ;-)
>
> --
> Regards,
>
Keith
Silver Fox
Dave talks about require a little bit of pressure to open and close and
at Idle Merc fuel pumps sometimes don't have enough suck to keep the
valve open and consequently the symptoms you describe. ie I don't buy
the gummy thing as we are talking brand new.
I to have had the bulb replaced on my Merc 135 (carb model) under
warranty for the same reason. It was a pain when water sking. Actually
for a while here in NZ the Merc people were advising dealers to use a
OMC bulb because they needed less pressure to work.
I was surprised an Opti had this problem as I thought they and EFI
engines did not need bulbs because they have electric fuel pumps or am I
wrong.
Silver Fox
Jim Burmeister wrote:
>
> Have a 98 - 225 Merc Opti here........ which had a dry bulb problem after trolling slow for a while.
> Caused the engine to quit while running slow trolling. I called the factory as the dealer had no good clue.
>
> Merc warranty replaced the bulb with one that now has a yellow ring on the upward end........
> all runs fine now.......
>
> They said they had many many bad bulbs where the valves were getting gummy and sticking
> shut when the engine was run slow for a period of time.
>
> One Merc dealer said they have been replacing them as standard procedure on ALL
> engines that have bulbs with out the yellow ring on the Up arrow end.
>
> anyway the comment is the bulb was not only soft but dry as no fuel was able to pass through it.
>
> .........Jim
>
> "Dave Brown" <da...@brownsmarina.on.ca> wrote in message news:39712973...@brownsmarina.on.ca...
Jim Burmeister
Bulbs can be sitting at the dealer with gas in um or from the factory as they all test run the stuff
as time goes by...........
Mine was new also but had been sitting on the show floor and had some gas in the line.........
so gummy fix ....bulb change worked......
Merc said get the yellow stripe bulbs in every case ......as sooner or later you will
have the problem if you do not change um.
guess it may also be how far away and how low the gas tank maybe from the engine.......
pulling fuel back down the line.
Mine runs to a 92 gallon tank center of the boat laying across the bilge ....so the run and drop
both were working against me.
anyway it fixed the issue ......so far ......Jim
"Silver Fox" <f...@voyager.co.nz> wrote in message news:397333...@voyager.co.nz...
Rich
dandy siphon hose by putting a piece of hose on either end of the old one :)
Ted G
different?? I only use them if the motors haven't been started for a while.
The fuel lines have elec pumps to prime them.
Ted
Dave Brown <da...@brownsmarina.on.ca> wrote in message
news:39712973...@brownsmarina.on.ca...
Silver Fox
>
> OptiMax are DFI not EFI .........
I think you have been a bit quick when reading what I wrote. I said Opti
or EFI not Opti is an EFI. Prior to Opti EFI engines were produced by
Merc.
> Bulbs can be sitting at the dealer with gas in um or from the factory as they all test run the stuff
> as time goes by...........
> Mine was new also but had been sitting on the show floor and had some gas in the line.........
> so gummy fix ....bulb change worked......
> Merc said get the yellow stripe bulbs in every case ......as sooner or later you will
> have the problem if you do not change um.
Not in my case. My motor arrived on back order still in its original
packing case from the factory. I can assure you there was no petrol
sitting in this baby when it arrived. The bulb fitted had never had
petrol through it unless they have a way of using the bulbs while still
sealed in its plastic bag.
> guess it may also be how far away and how low the gas tank maybe from the engine.......
> pulling fuel back down the line.
>
> Mine runs to a 92 gallon tank center of the boat laying across the bilge ....so the run and drop
> both were working against me.
>
> anyway it fixed the issue ......so far ......Jim
Thats the bottom line. Who really cares the details of the problem if
its now fixed.
Silver Fox
mathuranatha das
wayne.b...@gmail.com
Wow, a couple of names here from the Way Back machine - Dave Brown and Larry W4CSC, both prolific posters here 20+ years ago. We had the pleasure of meeting Dave in the summer of 2000 when we stayed overnight at his marina on the Rideau Canal in Canada. Larry W4CSC is/was a ham radio operator in Charleston, South Carolina, and was the rec.boats guru of all things electronic, as well as being a prolific Harry Krause protagonist.
https://www.brownsmarina.com/
Keyser Soze
> Larry W4CSC, both prolific posters here 20+ years ago. We had the
> pleasure of meeting Dave in the summer of 2000 when we stayed overnight
> at his marina on the Rideau Canal in Canada. Larry W4CSC is/was a ham
> radio operator in Charleston, South Carolina, and was the rec.boats guru
> of all things electronic, as well as being a prolific Harry Krause protagonist.
>
> https://www.brownsmarina.com/
>
--
Lock Trump Up