OK, keep in mind that this is the instructions for a pre-94 stang, but it should be fairly similar.....I typed this out of a Haynes manual a couple of years ago...hope it helps (knew I kept this for a reason
ELECTRIC IN-TANK FUEL PUMP (FUEL-INJECTED MODELS)......duh
1. Relieve the fuel system Pressure:
*a) The fuel pump switch - some times called the "inertia switch" - which shuts off fuel to the engine in the event of a collision, affords a simple and convenient means by which fuel pressure can be relieved before servicing fuel injection components. The switch is located in the luggage compartment (trunk), in a variety of locations (Illustration show it in two places 1. underneath the trunk latch or on the side under the drivers side trunk lid hinge) and is usually covered by the carpet which comes up the sides of the trunk. In some cases the wiring from the fuel pump to the fuel pump switch can be trace to help locate the switch.
b) Unplug the inertia switch electrical connector.
c) Start the engine and allow it to fun until it stops. This should take only a few seconds.
d) The fuel system pressure is now relieved. When your finished working on the fuel system, simply plug the electrical connector back into the switch and push the reset button on the top of the switch.
2. Remove the fuel tank.
3. Using a brass punch or wooden dowel only, tap the lock ring counter-clockwise until it is loose.
4. Carefully pull the fuel pump/sending unit assembly from the tank.
5. Remove the old lock ring gasket and discard it.
6. If you're planning to re-install the original fuel pump/sending unit, remove the strainer by prying it off with a screwdriver wash it in clean solvent, then push it back onto the metal pipe on the end of the pump. If you're installing a new pump/sending unit, the assembly will include a new strainer...... Aren't you glad you just read that.....sure glad I typed it......****
7. Clean the fuel pump mounting flange, the tank mounting surface and seal ring groove.
8. Installation is the reverse of the removal. Apply a thin coat of heavy grease to the new lock gasket to hold it in place during assembly.
Sound easy enough....just be patient, it is time consuming but really not THAT bad. The book did also have instructions for a "chassis mount fuel pump", but the only pump I have seen like that on a SN95 was a Vortec unit.