elec fuel pump orientation
Posting Guru
Joined: Mar 2005
Posts: 1,701
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From: KY
I have put several electric pumps on Fords with 6.9's and 7.3 and the pump I used is a GM pump for a 6.5. The P# is EP309. They are not expensive. I haven't seen one I put on fail yet. We had GMC medium duty trucks, also, at the dealer I worked at and we rearly saw one of these pumps fail. They go inline, pull low voltage. They are a pulse pump. I use one now for priming fuel systems on trucks I work on now. It is a handy "tool" to have around just to pump fuel out of something. You can make a cover to go over the hole. Any thin piece of metal will work.
Posting Guru
Joined: Aug 2006
Posts: 2,175
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From: Kent WA
Originally Posted by 2jhanna
dave7.3, i replaced a mech fuel pump on a `74 f-100 gasser, after 20 years that was still good. i was planning a 22 hour trip in it so i replaced a lot of stuff at the time.
i think it was dave sponaugle stated a while back in a simliar thread that he had not replaced a lot of mech pumps. (i might be wrong on who said it though).
when i added a electric pump a couple of months ago, a did not want to chop a lot of fuel lines either, i mounted mine beside the mech pump on the frame rail and removed the existing rubber line from the mech pump, hooked it to the electric pump and another rubber line to the steel line. no cutting involved.
one of the beauties with this is that both pumps are side by side and it is real easy to bypass either one if needed.
also, i did not get a diesel bath at all !!!
i think it was dave sponaugle stated a while back in a simliar thread that he had not replaced a lot of mech pumps. (i might be wrong on who said it though).
when i added a electric pump a couple of months ago, a did not want to chop a lot of fuel lines either, i mounted mine beside the mech pump on the frame rail and removed the existing rubber line from the mech pump, hooked it to the electric pump and another rubber line to the steel line. no cutting involved.
one of the beauties with this is that both pumps are side by side and it is real easy to bypass either one if needed.
also, i did not get a diesel bath at all !!!
Maybe you could leave it full of fuel and hook a line between its input and output and let it just recirculate the fuel internally to avoid damage due to dry pumping.
PSD Addict
Joined: Nov 2006
Posts: 731
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From: Michigan
Correct me if I'm wrong but the mechanical pump shouldn't need fluid for any reason. I really like this idea but was concerned about two things, one Cheeper mentioned, the other was the open 'in' port, for this I figured I would use a pneumatics exhaust. the only reason I could see the mechanical needing fluid would be just to keep the diaphram from drying out??
Posting Guru
Joined: Aug 2006
Posts: 2,175
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From: Kent WA
Originally Posted by TurtleRacing
Correct me if I'm wrong but the mechanical pump shouldn't need fluid for any reason. I really like this idea but was concerned about two things, one Cheeper mentioned, the other was the open 'in' port, for this I figured I would use a pneumatics exhaust. the only reason I could see the mechanical needing fluid would be just to keep the diaphram from drying out??
The possibility of it sucking dirt, water, etc. into the input port is also a concern that would be addressed by connecting the input and ouput ports....
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
I would guess you owuld be right about that, between heat and drying out, I doubt the diaphragm will last. Mechanical pumps don't tend to fail regularly, but neither do the electric. Mine was more of a convienience of priming than anything, and a couple times I push my luck too far and run dry, it has really saved my behind. It primes up fast, crank a bit to clear the lines, and we're off.
It may not be as big an issue with diesel, but the electric pumps are best placed close to the tank. It may be such that diesel is heavy enough that it isn't as big a problem as with gas, since you can't vapor lock a diesel...
It may not be as big an issue with diesel, but the electric pumps are best placed close to the tank. It may be such that diesel is heavy enough that it isn't as big a problem as with gas, since you can't vapor lock a diesel...
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
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Senior User
Joined: Jun 2004
Posts: 477
Likes: 1
From: florida
when i bought my 91 ford 3 years ago it had an electric pump with a toggle switch, i assumed it was to be used for priming the mechanical pump. but i soon found out the truck wuold not start unless the electric pump was on. so i bought a new mechanical. same problem, so i removed the mechanical all together and blocked the hole. best thing i ever did, i don't know how old the electric pump is, but it sure works good.
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