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1985 Ford F-150 Truck (EFI) Fuel Problems

My Old 1985 Ford F-150 (5.0, 302 - EFI) want crank, it was running fine. The next day it want crank, I sprayed fuel injection it will run and then cut on.I changed the fuel filter in the reservoir and i noticed there is no gas in the reservoir when i took it back off to check it. I took the fuel lines loose down stream of the fuel pump and turn the switch as attempting to crank, no fuel coming out of the Electric Fuel Pump.I have reset the Cut Off Switch / Inertia Switch and it still want crank. I traced the fuel lines and I cant find another fuel filter. Need help please.

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Same problem with my 85 F-150 5.0 EFI---turned out that the fuel pump relay under the hood was teriffically corroded on the inside (I opened up the relay to look inside). When I checked the voltage at the fuel pump it would show 3.5-6 volts instead of 12 volts.

I was thinking fuel blockage or perhaps failure of the in-tank pumps. Sometimes the truck would start and run, othertimes it would neither start nor run. Typically, if running it would stay running until turned off (where the relay had to break).

Changing the green fuel pump relay fixed the problem--12 volts now at the pump and no reoccurance.

Good luck--let me know if this fixed your F-150.

riippa@aol.com

Posted on Sep 22, 2009

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No the pressure is suppose to be at key on engine off between 35-45 psi...when running between 30-45 for a 5.0 i just changed the same motor and am also having the same fuel problem. I forgot about the inertia switch but it's probably the fuel pump in your case.

Posted on May 02, 2009

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Where is the innertia switch on 1987 f_150

Posted on Jul 08, 2010

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Check your fuel pressure,it should be between 28-35 psi,if its to low check fuel filter or fuel pump,to high check fuel pressure regulator. Fuel pressure regulator is located on the top of the gas tank. You can get to it from under the trunk where the fill tnak is

Posted on Feb 14, 2009

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SOURCE: 1985 Ford F-150 Truck (EFI) Fuel Problems

If you chk. all fuses and relays and pump is not pumping gas then its pump thats bad, you kind of answered your own question here.

Posted on Feb 14, 2009

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2 Answers

Truck dont have the power all the time


SOUNDS LIKE A FUEL FILTER IS GETTING PLUG REPLACE IT . IF THAT DOES NOT HELP CHECK THE FUEL PUMP, IT IS NOT GETTING ENOUGH FUEL

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is the engine light on, check for codes.
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1985 Ford F-150


if engine won't crack - dead battery
if engine cranks but won't start - no fuel or spark
fuel reservoir is the fuel tank.
a fuel filter can be inside a housing...

Feb 22, 2009 | 1985 Ford F150

1 Answer

1985 Ford F-150 Truck (EFI)


No ,I haven't Fixed my problem, I'm still awaiting solutions and feed back from helpful people that may have went thru the same problem. My Wife is out of work so it's a little tough on me right now. I want to correct the problem myself.

Feb 14, 2009 | 1985 Ford F150

3 Answers

1985 Ford F-150 Truck (EFI) Fuel Problems


i actually have a 1985 302 efi... there are 2 pumps one one the rail right under drivers door and one in the tank.. there are also two filters... one just behind the pump one the rail.. its actually inside a canister that you open with a oil filter wrench then it has a paper element inside..then there is a inline filter that is actually part of the high pressure line the hose is about 3 feet long and runs from your front pump up to the fuel rail agaist the firewall...this one is really hard to find (Buy) good luck wish i hade a carb

Feb 14, 2009 | 1985 Ford F150

1 Answer

It uses too much fuel. 2,6 liter per 10 km.


You need to replace the sensors,,Throttle PositioningSensor, OXYGEN sensors, Mass Air Flow. after which your truck will run nicer and use less fuel.

Jan 16, 2009 | 1990 Ford F150

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