Question: Have a 1990 F150 with Haynes manual. Have dual tanks and both fuel pumps continue to run after motor is turned off. Have to disconnect battery to stop fuel pumps from continuing to run.
I suspect a faulty fuel pump relay. Where is that relay located on a 1990 Ford F150 and is it pull-able? Also, any other ideas on why the fuel pumps continue to run if the relay turns out to be OK ?
Truck starts/runs fine as far as I can tell.

Turn the ignition on and look for the clicks. Click once is “on,” seconds later Click once is “off.” Hopefully someone else can give you a more direct approach. For some vehicles the relay will supply ground to the pump. A ground short could leave it running. Somewhere in the area under the master cylinder. The F350s I’m used to have a plastic cover over the EEC & fuel pump relays attached to the back side of the washer resivour. the one with the green plug is the fuel pump & your problem WILL be solved by replacinWell, interesting. That would work *if* the relay were operational. As it is now, it is “stuck” and hence does not click. If it clicked, the fuel pump would shut off…so,
back to the question — where is the fuel pump relay on a 1990 Ford F150 custom truck? Anyone? Please?

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