How do you change a fuel pump on a 2002 GMC sierra, 1500 HD?

Remove the bolts that hold the bed box to the frame, disconnect the rear light wiring harness and the fuel filler pipe. Set up a pair of saw horses or something behind the truck. Then have four guys to lift on all four corners and set the bed on the stand you have ready. The bed is heavy! And there is the fuel pump! Replace with the new and take care to put the wiring harness for the fuel pump back where it was. Replace the bed, bolts and connect the lights. You are ready to go! Takes about two hours if you don't break the welds that hold the nuts for the bed bolts loose. Good luck!