electric fuel pump issue

Raybo Marine NY · Post by **Raybo Marine NY** » Nov 24th, '10, 11:03

I am out of ideas on this one.
I have a aircraft tug, gas powered.
We got it with a electric pump already in it, we go through a pump a year, sometimes more often

I have tried Airex, Carter, and Mr Gasket

I originally thought it was because we would run out of gas, but we have not been doing that anymore.
I put the fuel through a 10 micron spin on filter, and it has the little filter on the pump itself.
Only thing I can think of is that we sometimes will burn up gas that we remove from tanks we are changing, sometimes this fuel is not that great.

I just burned out another one, and it happens without warning. Getting tired of it and I am out of ideas, also tried a different power source, same thing happens.

Rawleigh · Post by **Rawleigh** » Nov 24th, '10, 11:24

Could it be too much head (suction) pressure on it from the filters? Try putting the finer filter on the pressure side.

coolair · Post by **coolair** » Nov 24th, '10, 11:39

raybo
you talking about those little 12v pumps handing on the shelf at the auto parts? kinda square looking? i dont think they are designed for real serious duty
what engine is in it?

In Memory of Vicroy · Post by **In Memory of Vicroy** » Nov 24th, '10, 12:57

Check with Allen Machine Co - they advertise in Boats & Harbors and have always carried surplus military electric fuel pumps, 12 & 24 volt. I don't see the fuel pumps in their current ads in B&H but they probably still have 'em - heavy duty and cheap. 800 451 8899...nice folks too.

UV

Rocky · Post by **Rocky** » Nov 24th, '10, 13:32

Positive displacement type or centrifical? When you say burnt out do you mean the motor stops or the motor runs but no fuel output? Overheating is one reason I was told, the fuel cools the pump side and if not enough will overheat. I have countless hours on Walbro FRB-13-2 recipricating pumps as they shut off when pressure is developed on output side.(Say the floats are close to closing/idling engine) and that prevents overheating them Walbro says. www.go2marine.com has them I believe.

Raybo Marine NY · Post by **Raybo Marine NY** » Nov 24th, '10, 13:45

thanks everyone

engine is a Chrysler flathead 6

current one is a Mr Gasket pump. Its not like I am running all day with it either, few minutes here and there, maybe 1/2 hour at most.
Sometimes it goes days without running.

Feeds a single barrel carb. I just put another one in and moved it back by the tank so its only sucking 8" or so then it pushes another 3-4', supposed to be more efficient at pushing then pulling so I will see how long this one lasts.
I have it on a switched power source that is fused.

Harry Babb · Post by **Harry Babb** » Nov 24th, '10, 18:09

My old 454's has Carter fuel pumps. The starboard pump gave me trouble several times.....it was like it lost prime. I would remove the fuel line and suck gas (YUK! ! ) thru the pump up to the carb, then we would be off and running until I let it idle,like trolling, for a while.

A mechanic buddy pointed out that these systems do not have a return line, therefore the pump is pumping dead aganist a nearly closed valve when the engine is running at idle.

He cured the problem by installing a valve in the line going to the carb and running a return back to the tank.

I had to complicate it a little more....so I went to Summit Racing and purchased a BYPASS type fuel pressure regulator and install it on my engines. Using a fuel pressure gage I set the regulator to hold 3 PSI at full throttle. It ran good........

Then from there I pulled the gas engines out and installed diesels.

I may have plans for the old gas engines.....but that is another story.

hb

Bob H. · Post by **Bob H.** » Nov 24th, '10, 19:19

Harry my thoughts exactly, built a big block with an electric fuel pump I had to install a pressure regulator to "feed" just enough to the carb as well as a return so the pump wouldnt dead head. BH

Raybo Marine NY · Post by **Raybo Marine NY** » Nov 24th, '10, 20:27

I had a regulator at one time ( its still in the engine compartment) and it still has the return line to the tank hooked up, I found I would have to pinch the line to get it to start sometime, maybe I needed to tweak the pressure a bit so I gave up on it.

Maybe I will try hooking it up again, its all there so its real simple to

when it runs its running just kind of off-idle, just moving boats around the yard

coolair · Post by **coolair** » Nov 24th, '10, 23:50

why not just put the stock fuel pump back on it???

Raybo Marine NY · Post by **Raybo Marine NY** » Nov 25th, '10, 08:29

coolair wrote:why not just put the stock fuel pump back on it???

good question- it never had one since we got it about 10 years ago.
I dont know if the original pump went bad or if whatever drives the pump wore out, maybe I will look into it but sometimes you leave well enough alone on something that old, its a 1957

RussP · Post by **RussP** » Nov 25th, '10, 09:18

1957 a verry good year!!!!

RussP

Raybo Marine NY · Post by **Raybo Marine NY** » Nov 25th, '10, 11:32

I had to go in today for a bit so I looked and as I thought the original mechanical pump is still there, so I will try to get one from the auto parts store next week, if there is no rod in there or its worn out maybe I can get one of those too

coolair · Post by **coolair** » Nov 25th, '10, 18:16

Went to oreilly auto parts and put in chyrsler and it shows a little electric pump, but its different than the mr. gasket pumps

http://www.oreillyauto.com/site/c/detai ... &ppt=C0025
you have been using something like this right?

http://www.oreillyauto.com/site/c/detai ... &ppt=C0128

Raybo Marine NY · Post by **Raybo Marine NY** » Nov 26th, '10, 10:23

coolair wrote:Went to oreilly auto parts and put in chyrsler and it shows a little electric pump, but its different than the mr. gasket pumps

http://www.oreillyauto.com/site/c/detai ... &ppt=C0025
you have been using something like this right?

http://www.oreillyauto.com/site/c/detai ... &ppt=C0128

I have tried both of those pumps

bertram31.com

electric fuel pump issue

electric fuel pump issue

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