Question about 1988 Ford F 250

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Truck does not start no power at fuel pump

I Have a 1988 FOrd f 150 4.9 litter. I took the line off at high fuel pump little gas to none at all. took pwer line off to it no power to it when the igntion is on. what could be the prob.

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  • Anonymous Feb 15, 2009

    where is fuel pump relay

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Under left side of dash by drivers left foot is the fuel pump switch.On top of the switch is a button press it to make sure it hasn't tripped

Posted on Apr 18, 2009

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Where is the fuel pump relay switch

Posted on Feb 08, 2009

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Replace fuel pump relay .

Posted on Dec 26, 2008

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Drive 1988 ford f150 on the highway it dies and won,t start back. It acts like it is out of gas. Let it set 30 mins. and it starts right up


Fuel Pump-a possible. The time frame of 30 minutes will vary.
The armature on the pump motor is worn, as well as the tiny bearing,so it seizes or just stops conducting current.
Drop fuel tank and replace. May be able to remove all bed bolts but rear ones, and tip bed up.

Sep 28, 2010 | 1988 Ford F 150

1 Answer

My truck has 2 gas tanks, I try to swich the tanks but it only sucks gas out of the rear tank it doesn't matter what the selecter is on what could be the problem?


I have an '87 Ford F150 just like it and have the same problem too. Most likely the front fuel tank's internal fuel pump is not working. The selector switch sends power to the fuel pump in the selected tank, which then pumps fuel to the high pressure pump mounted on the frame ahead of the dual fuel reservoir also mounted on the frame.
Typical ford junk engineering - quality job NONE!!!

Sep 20, 2010 | 1987 Ford F 150

1 Answer

My 1988 Ford Bronco 5.0 has been stalling / acting like its run out of gas. (Has always run great before) I know it has plenty. Today 7.28.10 It stalled twice, first time it did it had at least 1/4 tank,...


You might have what is called vapor lock. The fuel gets so hot that it boils in the fuel pump or the lines. Do this test spay water on the fuel pump to cool it off . ( this only works for a few minutes before it gets to hot and vapor locks again ) If you can Keep the engine heat Off the lines and the Fuel pump it might help. If you have metal fuel lines near a heat source rap them with something such as rubber fuel line sliced down the middle to keep the heat off them If you are using an aftermarket electric fuel pump relocate it down low near the gas tank ( they work better pushing than pulling ) away from any heat source such as exhaust If your using the stock fuel pump try replacing it with a new one it might be getting weak Replace the fuel filter while your at it.

Jul 28, 2010 | 1988 Ford Bronco

1 Answer

The truck doesn't start it will turn over but it doesn't fire.


To diagnose a fuel pump problem you will need a fuel pressure gauge that attaches to a test port on the fuel rail on the engine. The pressure should be a min of 40 psi. To change the pump you will have to remove the gas tank.

Apr 05, 2010 | 1983 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

4 Answers

1985 Ford F-150 Truck (EFI) Fuel Problems


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

Feb 14, 2009 | Ford F-150 Cars & Trucks

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