Fuel pump will not shut off


Asked by Jan 22, 2016 at 04:25 PM about the 1989 Ford F-150 S Standard Cab 4WD SB

Question type: Maintenance & Repair

Turn switch on and fuel pump runs for a few seconds. Then cuts off.
Mine keeps running.

2 Answers


Suspect the fuel pump relay. Normally the fuel pump relay operates during starting and when turning off the engine. If it is stuck, the pump could continue to run. A full explanation of how the relay works and how to check it is quite long. I suggest you check the net for info on how a fuel pump relay works and conduct the electrical test. It is straight forward. Basically, if the relay is sending power to the pump with the engine off, it is defective.


Fuel Relay contact stuck closed. Replace relay

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