fuel problems, HELP
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New User
Joined: Jul 1999
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fuel problems, HELP
I have an 87 F-150 that used to be EFI that was changed over because the engine was modified and they put a carb on it. Now I'm having problems getting fuel to the carb. My question is, is it possible to just use the in tank fuel pumps and bypass the electric fuel pump that's on it, to go directly into the carb? Any and all comments and help will be greatly appreciated, cause as of right now I'm without a truck. Thank you.
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Joined: Jun 1999
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fuel problems, HELP
Yes,what Rodger stated is correct,but for a EFI system.For your situation,you will have to bypass the in-frame pump because it is capable of putting out 100psi when not regulated!The in-tank pumps are a lower pressure,somewhere around 10-15psi{verify this,please},but still too much pressure for a carb{unless it's 514 w/nitrous},but is easily regulated with a simple pressure regulator from Holley or simular.If the in-tank pumps no longer operate because the computer has been disconnected,you can modify the existing wire harness and relay to work with the turn of the ign. switch{a careful study of the wiring diagram will clue you in}.In the worst case that the in-tank pumps are shot,you will have to remove the pump/sender assy. and either buy a new pump or retrofit a pickup/sender assy. from a carberated truck{you will then have to install an electric pump externally to feed the fuel to the front.
Phillip
Phillip
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fuel problems, HELP
I believe that the high pressure chassis mounted electric fuel pump was removed when the engine was changed over. They then put on a aftermarket electric fuel pump which feeds the fuel filter. Then the hoses go up to a Mallory fuel terminal (I don't know what exactly this thing is) then to a pressure gauge (which I assume is to check the pressure of the gas.) Then to the carb if I remember correctly. The computer has been disconnected therefore, I'm not sure if the in-tank fuel pumps will work. I'm going to try and start figuring out exactly how the people who owned this truck before me had it wired. Thank you for your input and any more info will be greatly appreciated.
