Fuel Pump Question
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Elder User
Joined: Apr 2015
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From: Boston, KY
Fuel Pump Question
My 1987 was originally a 5.8 EFI engine, now it's a 7.5 carb engine with a holley fuel pump bolted to the frame, running off the front tank only. The original EFI pump is in the front tank and wired, but non-operational. Since the sending unit doesn't work, I need to decide what to do about the pump when I replace everything. I don't really need the in-tank pump, but I am hesitant to leave two loose pump wires swinging around inside the fuel tank, waiting to cause a spark when they bump.
I tossed the rear tank (rusted through and full of sludge) and am starting from scratch. I want to keep the current wiring harnesses and tie in to the stock fuel tank selector. I thought about just going with in-tank high pressure pumps, but that would require replacing all the lines back to high-pressure fittings.
I tossed the rear tank (rusted through and full of sludge) and am starting from scratch. I want to keep the current wiring harnesses and tie in to the stock fuel tank selector. I thought about just going with in-tank high pressure pumps, but that would require replacing all the lines back to high-pressure fittings.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Don't try to run a carb with HP pumps. I tried it once, but the fancy Aeromotive regulator just couldn't get it down to 6 psi. It said it could, but I think the return line is too small and won't let it return enough fuel to get it down to 6 psi.
I ended up with a small inline Facet pump. Much quieter then a Holley!
As for electrical. I would remove the wires from the plug that run the pump, then you don't have to worry about them being inside the tank.
I ended up with a small inline Facet pump. Much quieter then a Holley!
As for electrical. I would remove the wires from the plug that run the pump, then you don't have to worry about them being inside the tank.
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Elder User
Joined: Apr 2015
Posts: 613
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From: Boston, KY
Good to know! I thought about using high pressure pumps with a regulator, but it would be a lot more work and cost in the long run. I wasn't sure if I could pull the wires cleanly from the assembly or not...just don't want loose powered wires inside my gas tank. The hot wire for the rear fuel pump (truck wiring, not fuel sender) is already cut, but I don't want to cut any truck wiring if I can help it.
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Montync
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Feb 25, 2017 08:10 PM
