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There is a one-way valve stuck in the fuel filter housing, on the input hose. I had the lift pump diaphragm fail. Pieces of it got stuck in the valve. After replacing the filter and pump, the flow still was not good. I looked in the tank from the access hole. It and the sock were clean. I...

Or pull the plug on the bottom of the tank and stick your finger in to see what you pull out... You can only pull the sender and look in, if your hmmwv has the access hole in the bed.

You may be able to remove the top plate if nothing was attached to it, it was turned sideways and pulled out at an angle. And, all the nuts holding it to the tank would need to not be there. You can't reach the nuts.

When you disconnect the return line from the injection pump, nothing will come out of the HOSE while running. It just connects to the fuel tank.

Make or buy a 3-way wire. male one end. female another end. whatever for the third end. hook the male and female to the truck. Hook your multimeter to the third end.