I think I can help you David. I'm changing mine today on a 1999 f150, first I bought a new OEM pump from http://www.fordpartscenter.net
for $197.00 plus $10.00 shipping. DONT drop the gas tank only by yourself, you need truck up on a lift and experience in doing it. Remove the 6 bed bolts and raise the bed up on 4x4 scrap lumber, drop off the rear bumber and spare tire, remove the three screws at the filler neck and it's clamp by the frame, the gas cap will pull off the bed easily to keep the tank capped off and you safe. Remove both rear tires and then you can by yourself slide the bed back about 18 inches. Now you can replace the pump easily and SAFELY. Check under the bed for a hose and a metal guard, they can hang you up. You have one wiring harness connector to separate for the tail lights behind the bumper also. I was 70 last Oct and it has taken me about 5 hours to get to the point of now unbolting the pump itself for replacement, I also have a lot of tools but I'm slow.
Good luck David