Truck wont start

For a start, use a gage and check fuel pressure. Has the fuel filter been changed recently? The filter maybe part of fuel pump assembly, haven't looked, yet. Engine cranking, check voltage and ground for the pump motor at the rear. If good voltage and ground with no pump action, suspect the pump.

Do you have any driveability issues?

Yes, check at the fuel pump connector. Intermittent issues can be a pain to track, You have to test when problem is ongoing. An intermittent rough idle, I don't that is your pump.

I was going to post a diagram. Orange wire is voltage, black is ground. I thought you had an intermittent idle? Are you saying the vehicle will not start? I got my wires crossed, somewhere?

The orange wire with red tracer has voltage, when cranking. Check the black wire for ground. For ground that goes to chassis, you can use a test lite connected to battery voltage, touch the terminal for the black wire, if the lite comes on, the ground may be ok. If it doesn't come on, faulty ground.

One black wire is for the sending unit, that isn't the one you want to check.

Usually you don't use a 12 volt lite to test ground that goes to computer. An LED should be safe for computer.

If the orange wire with red tracer has good voltage and ground is good, no clogged lines, connector is good, looks like the pump is faulty. I looked at Napa for that pump, 500 bucks, not including tax.

Hope you got it going your way.