A few ideas that I have: Bad connector at the fuel pump. May not be making full contact with pump terminal
Bad connector in the harness between fuel pump relay and fuel pump. Possible corrosion in a connector causing a loss of contact.
Wire going to fuel pump rubbed through on chassis. These harnesses do go through some places where they can rub and not be seen.
Tank or pump grounding. You need a ground to complete the circuit. Getting power to the pump is only half of the battle. Make sure that the pump is properly grounded.
I suggest some checking and tracing of wiring. Start at the fuel pump relay. See that it is getting voltage where it should be getting voltage. Next, see if it is truly being energized and passing power into the pump circuit.
If all else fails, and you need the truck, you may want to think about calling in an expert. It may cost a bit in the short run, but will pay you in the long run.
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