How can you test the fuel pump in a 1991 Toyota 4Runner to make sure it needs to be replaced before dropping the gas tank?

Testing the fuel pump is easy, and makes sense prior to dropping the tank to replace the pump. In the Engine Compartment on the passenger's side, there is a small box located on the fender well and should read "Diag" or "Diagnos". Open this box, on the inside/top of the box, there is a diagram for the electrical layout. One should be labelled "FP", and is most likely top left. Take a test wire and plug it into the "FP" receptacle and jump directly to positive side of battery terminal. If your pump is good, you will hear it running. If your pump is good, you most likely have a problem with your fuel pump relay located in the passenger's kick panel.