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siphon gas out drop the tank undo the harness twist the retaining ring pull pump. install in reverse.
probably be easier to just pull the truck bed off. usually requires unbolting 4-8 bolts holding bed on from inside the floor of bed. unhooking wiring harnwess and unhooking gas tank filler neck from hose leading to tank. you will need help of at least 3 others to pull the bed unless you devise a lift or a stand for your bed to sit on. think of it like a semi truck unhooking from a trailer. bed stays put truck moves forward. replace pump and back up under the bed and reattach. good luck
That depends on how much fuel is in the tank, if the tank is full or at least half, then removing the bed is easier, if the tank is less then half full removing the tank is easier. It all depends on where your fuel level is to what is easier. The only other thing that I can think of is that if you do not have a second person to help you remove the bed, then dropping the tank with a Jack would be easier, so it all depends on what your situation is.
Removing the bed is in no way easier than just dropping the fuel tank, and the fuel tank was designed to easily be dropped down from the vehicle. Who ever told you that removing the bed was the easier way is certainly not an auto technician or even a mechanic.
The fuel pump is in the gas tank, the best way to do this is to get some friends and remove the bed from the frame. There is i believe 8 bolts that hold the bed to the frame, and don't forget to remove the hardware to the gas tank filler neck. Once the bed is off the frame, you can get to the fuel tank. Disconnect the wire harness and might as well replace the harness since there only $12.00 last i looked, disconnect the fuel line and return line. Remove the fuel pump retainer ring and lift up on the fuel pump sending unit. To install replace the rubber O ring and oil it before installing the new fuel pump sending unit. Install the fuel sending unit retaining ring, gas lines, new wire harness, and filler tube. Good lime also to check the hose to the EVAP since you can inspect them, look for any dry rot to the vacuum lines and replace if needed. Reinstall the bed and use lock tight to the bed bolts or replace them with stainless bolts. Good luck and hope this helps, oh and you might as well change the fuel filter while your have the bed off. The other way is to drop the gas tank which means draining the tank and raising the truck.
Being a 94 truck, you can rest assured the pump is in the tank. As for the pull bed, or drop tank question, it is up to you. I always pull the tank on every vehicle, unless someone has cut an access hole through the top of the body. There are a lot of people with a fuel pump change in their future, because the oil companys have changed the additives they put in the fuel we use, and it eats the seals in the old pumps. (they don't want you to know that) It is a lot easier to change an in tank pump than most people make it out to be. (Ah laziness) Hopefully the tank is low on gas, or empty, or it is gonna be really heavy.