I think I have a fuel pump problem. The truck will start and when take off it will be sluggish like it has no power but once it gets going it will run.No get up and go and now it starting not to start just turn over or kill the battery tring to start.So I will let it sit for a couple of weeks or months and it will start up and run with the same sluggish and then it wont start again.It does have over 100,000 miles on it
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Don't drop the gas tank. Pull back the carpet in front of the rear seat and there will be a square cover closer to behind the passenger seat with 4 screws holding it down. Remove that cover and it will expose your fuel sending unit cover. This will be circular in shape with 6 or 8 small philips head screws holding it in place. Unfortunately they will probably be very rusty and hard to get out. You will first need to disconnect the electrical plug and the 2 fuel lines. After removal of the fuel lines and the screws carefully remove unit to expose fuel pump.
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.