Question about 1990 Ford F150

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No current to fuel pump - 1990 Ford F150

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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.


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Posted on Nov 06, 2010

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Unlikely the breaker is faulty, but it is possible.

Most likely the pump is consuming too much current or more current than the breaker is designed to cope with.

A fuel pump is simply a pump driven by a motor that is designed to provide a greater volume of fuel than the engine could ever need right from the initial startup to maximum load and speed. It is the fuel pressure regulator that provides the chosen fuel line pressure and fuel constantly circulates at that pressure therefore the current the pump motor consumes remains constant regardless of the engine speed or load.

Should there be a fuel line blockage, for instance, any healthy pump will be capable of generating a pressure sufficient to burst many types of fuel hose/pipe and it is only when something like that happens or an adjustable fuel pressure regulator is used that is adjusted for a greater than design pressure that the pump will work harder and consume more current.

I suggest you check the fuel line pressure and adjust or replace the regulator if it is significantly higher than specification and then measure the current being consumed by the pump if the breaker is still tripping. If the current is within limits replace the breaker and if the current is excessive you should seek guidance from the people who rebuilt it.

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