gandalf
Senior Member
I think JesusFreak (I think is was JF above) is thinking along the right line. I'd say the problem is at the fuel selector valve, mounted on the frame rail. It may have an intermittent short (good luck on that), or it is sucking crap from the tanks. In either case it is blocking the fuel flow.
Try an alternative fuel source. Try setting up a jerrycan feed directly into the lift pump. In doing this you will eliminate the entire fuel system between the lift pump and the tanks. If that works, move the temporary connection back toward the tanks, say on the engine side of the fsv. If that still works, move to the tank side of the fsv. If it does not work, you've isolated the problem between the fsv and the lift pump. Simply put, keep moving the fuel source toward the rear of the truck, eliminating sections as they work well. You can even start by feeding directly into the fuel filter, eliminating the lift pump.
Keep us informed about your progress.
Try an alternative fuel source. Try setting up a jerrycan feed directly into the lift pump. In doing this you will eliminate the entire fuel system between the lift pump and the tanks. If that works, move the temporary connection back toward the tanks, say on the engine side of the fsv. If that still works, move to the tank side of the fsv. If it does not work, you've isolated the problem between the fsv and the lift pump. Simply put, keep moving the fuel source toward the rear of the truck, eliminating sections as they work well. You can even start by feeding directly into the fuel filter, eliminating the lift pump.
Keep us informed about your progress.
Last edited: