Pull the fuse for the fuel pump and then run the engine until it quits.
It doesn't have one.
Remove the gas cap. If you do not hear the pressure release, then press the shrader valve located on the fuel rail.
fuel pressure regulator
On a 1993 Mercury Grand Marquis : The electric fuel pump is INSIDE the fuel tank
On the fuel rail of the 93 explorer there is a pressure valve. With the battery disconnected, place a rag around the valve to catch any fuel. depress the valve until the fuel stops coming out.
Its on the end of the fuel rail
Could be the fuel pump, fuel pump relay or fuse
At the end of the fuel rail on the intake manifold
Cocosel de aur
35-40 lbs
Could be a very plugged up fuel filter or low fuel pump pressure due to a bad fuel pump or fuel pressure regulator.
Inside the fuel tank. Some '93 and later models have an access hatch from inside the trunk; If not you'll have to drop the tank to reach it.