Question about 1988 Ford F 150

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1990 f150 ford fuel pump will not stop running , ireplace the relay and that didnt work .but it will start once the truck set and warm up threw out the day

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I think your pressure regulater is bad, some are built into the fuel pump some older models were mounted on or near engine in the fuel line

Posted on May 15, 2014

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I dropped the fuel tank to drain old gas.I put new gas in and turned engine to start it didnt start. Should I be able to hear fuel pump if it is working?This is for a 1990 ford e-150 van.Also where the is...


Turn the key to the ON position without starting the engine. You should hear the fuel pump running for 5 seconds if working. This primes the gas to the injectors when doing this. If not heard running check the oil pressure switch for the 12 volts needed to run the fuel pump starts there on that harness. When the engine starts and the oil pressure reaches the normal pressure the computer shuts off that circuit and turns on the fuel pump relay to run the pump. The relay stays on till you shut the engine off

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Check the engine to body ground strap. Top rear of engine screwed to firewalll. Or ground the tank to the frame.? Good luck

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the only thing else to make it run is the ignition probably the ignition module

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Replace the fuel pump relay. And if your truck has dual tanks there's three fuel pumps, one in each tank and another secondary fuel pump.

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Did you check the fuel pump relay connector?, this connector tends to accumulate lot of rust that makes bad connections and can't get the right voltage for closing the switch and the pump won't start. also check the fuel shutt off switch and it's connection.

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Then the engine fuse may be blown it will be marked ECM I think, the fuel pump and injector circuits are two seperate systems, the fuel pump most likely has a stuck relay.

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Sounds like a clog somewhere.

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