How do you check fuel pump or change fuel pump?

the fuel pump is located at the rear of the car, in the gas tank. to replace the fuel pump, the entiregas tank must be completley taken out of the car

the fuel pump should "wine" (like a nice Merlot) or "energize" when you turn your key on. When the car is running it also "wines" like an electric motor. You can also hear this outside the car at the trunk. If your car will not start and you suspect it could be the fuel pump, turn your key on, and listen carefully for this sound. You may not have to replace the pump! I went to a repair shop to make an appointment to have the non operating fuel pump replaced in my 1991 Mercury Marquis. They told me the job would cost about $ 500.00 ! But they also told me to try something first.1. Jack up the rear of the car.2. locate the pump.3. Have a helper turn on the ignition switch, do not turn to "start". 4. Simutaneously, you beat on the tank where the pump is located with a rubber mallet. On the 3rd "cycle" of this routine my pump started to work & continues to do so.