Electric Fuel Pumps
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Cross-Country
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Electric Fuel Pumps
I have a 1987 F150 4WD with a 300 six cylinder. Got it 10 years or so back and never finished it. It has 2 fuel tanks and fuel problems. It has an add on external electric fuel pump and one fuel tank is not operable. Did these have electric fuel pumps in the fuel tanks or a block mounted mechanical pump and an electric diverter valve between pumps? Seems like I disabled the add on fuel pump and it still ran.
Logistics Pro
Joined: Nov 2013
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From: Mojave, Ca
1987 was the first year of the efi system in the F-series trucks that requires 40-60 psi. The pumps in the tanks are a carry-over from the carb days and only deliver around 7psi. The frame mounted fuel pump was added by ford in 1987 to boost the 7psi fuel pressure from the tank pumps up to 40-60 psi for the fuel injection system.
there was no mechanical fuel pump option in these years for efi trucks. If you see a mechanical fuel pump block off plate on the side of your engine cover, that's because ford was still producing carbureted truck engines til 1989, and your engine could have had a carb on it.
there was no mechanical fuel pump option in these years for efi trucks. If you see a mechanical fuel pump block off plate on the side of your engine cover, that's because ford was still producing carbureted truck engines til 1989, and your engine could have had a carb on it.
Mountain Pass
Joined: Jun 2016
Posts: 207
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From: West Tennessee
1987 was the first year of the efi system in the F-series trucks that requires 40-60 psi. The pumps in the tanks are a carry-over from the carb days and only deliver around 7psi. The frame mounted fuel pump was added by ford in 1987 to boost the 7psi fuel pressure from the tank pumps up to 40-60 psi for the fuel injection system.
there was no mechanical fuel pump option in these years for efi trucks. If you see a mechanical fuel pump block off plate on the side of your engine cover, that's because ford was still producing carbureted truck engines til 1989, and your engine could have had a carb on it.
there was no mechanical fuel pump option in these years for efi trucks. If you see a mechanical fuel pump block off plate on the side of your engine cover, that's because ford was still producing carbureted truck engines til 1989, and your engine could have had a carb on it.
Logistics Pro
Joined: Nov 2013
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From: Mojave, Ca
But to answer your question, yes, the mechanical pump will suck though a failed electric pump because the electric pump is centrifugal impeller pump, but it'll have a pressure drop due to the restriction of the electric pumps one-way valve.
Hotshot
Joined: Jun 2015
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I don’t understand the question. You would have 50-60 psi from the high pressure pump feeding a mechanical pump on the engine. What are you trying to accomplish?
Mountain Pass
Joined: Jun 2016
Posts: 207
Likes: 21
From: West Tennessee
I don’t understand the question. You would have 50-60 psi from the high pressure pump feeding a mechanical pump on the engine. What are you trying to accomplish?[/QUOTE]
Just asking ... I have an 88 that has the tank pump and the high pressure pump. Considering putting my 300 in which is an 86 with a carb . If I do that I can delete the high pressure pump and use the in tank pump or delete both electric pumps and use the mechanical pump on the 300 ... Which would not be computer controlled ...
Just asking ... I have an 88 that has the tank pump and the high pressure pump. Considering putting my 300 in which is an 86 with a carb . If I do that I can delete the high pressure pump and use the in tank pump or delete both electric pumps and use the mechanical pump on the 300 ... Which would not be computer controlled ...
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Cross-Country
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Wonder if you can replace the tank pumps with later model high pressure tank pumps and skip the 3rd pump?
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Hotshot
Joined: Jun 2015
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I think the tank also needs to be replaced because the opening is larger but I could be wrong. I’m pretty sure there are threads about it but why? I replaced the tanks and in-tank pumps when I got my truck because the “gas” in the tanks was more like syrup after sitting 10 years. I haven’t done anything else to the fuel system since. That was 12+ years ago.
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