Where exactly is the fuel pump switch on a 1992 ford Aerostar and exactly how to reset the switch?

The fuel pump inertia shut off switch is located on the toe-board to the right of the transmission hump, (inside vehicle), or on the kick panel to the right of the passenger seat, or in some cases/ (rarely) it's in the engine compartment. To reset all you do is push in the button on the switch itself, which is a rectangular slim box, approximately 2" high, by 2" wide and about 3/4" thick. Hope this helps you.