There is
no fuel pump shut-off switch readily accessible to the driver in a 1994 Pontiac Trans Am (or most modern vehicles for that matter). Fuel pump shutoff is typically handled through the car's computer system and safety mechanisms, such as the inertia switch (which cuts power in a collision).
While some older vehicles had a manually operated switch, this feature was largely phased out for safety and reliability reasons. To shut off the fuel pump in a 1994 Trans Am, you would need to disconnect the battery's negative terminal.