Question about 1990 Ford F150
Your diagram is shown below. The most likely failure is the relay. Find it in the engine compartment relay box. Swap it with another relay to see if that gets you going. Check the fusible link "W" while you're there. If the truck was in an accident, the inertia switch may need a reset. The only other thing that might cause a failure is the tank switch, if you have dual tanks. If none of these are the cause, I would interrogate the relay socket to see if the ground command on signal from the PCM is coming in. You would need a 12 volt test light to check that. Connect the test light clip to the positive battery terminal, turn the key on, and probe the relay socket terminals. One of them should light the test light when the PCM tries to turn on the pump. Let me know if you have any questions.
Posted on Nov 06, 2010
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Posted on Jan 02, 2017
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