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Before spending several hundres on a fuel pump, I recommend doing a fuel pressure test. You can get a test gauge pretty cheap at a parts store. If the pump is junk, you raise the truck, lower the fuel tank, unplug the electronics from the pump at the top of the tank, then with a hammer and flat head scrwedrive, gently tap the lock ring in a counter clockwise direction until it pops off. Pull the pump assembly out and install the new one. Reverse directions to install.
You will have to drop your fuel tank. This can be difficult if you don’t have a floor jack and some help. Removing the filler neck and fuel lines are usually the hardest. A couple of thing to remember are to use open end wrenches to loosen fuel line fittings and not to let the tank down to far before disconnecting the wires. Expect to spend 3 to 4 hours if you haven’t done this before.