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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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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