The fuel pump relay and socket has already been replaced due to some bad wires.
If I turn the key to the on position and the pump runs and shuts off after a second or two, the truck will start. If I turn the key to the on position and the fuel runs and doesn't shut off, the truck won't start.
What made me think that it was the pressure regulator is the fact that the only time the truck won't start is when the pump runs continuously. I figured that if the regulator was stuck open, too much fuel would be bypassed back to the tank and there wouldn't be enough fuel for the injectors.
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