99.97% chance the fuel pump is deader than a door nail. Get an ACDelco, or Delphi pump. Before installing the pump, check to see if the hose between the pump and sender line is cracked. I would replace the pump either way, because if the hose is cracked, then it is possible that the pump is still working, but it is also probable that if the pump is not dead, it will die shortly after fixing the hose.
Removing the tank when it is partially full is not all that bad, but drain it before reinstalling it. I put mine on a pair of sawhorses, and siphon the gas into a can(s). Installing it when empty is far easier than when partially full.
There is a wire that holds the hoses over the axle, and two of the hoses have "quick disconnects" that usually are not quick. and one that is a clamp. It is easiest to unscrew the filler neck from the filler shroud at the gas door, and lower it with the filler neck attached. You will not spill any gas that way. There is a ground strap on the filler neck. The electrical connector is at the left rear of the frame. The rear strap bolts are 13mm on both ends, and the front bolts are 15mm. Put the rear bolts in the straps first, and pull the tank up with the front ones. Make sure there are rubber isolators where the tank touches the frame rails. There is a small V groove in the tank for the wiring.