Where is the fuel cut off switch located on a 1993 Ford Fiesta?

There isn't a readily accessible, easily-located fuel cut-off switch on a 1993 Ford Fiesta like you might find on some larger vehicles or equipment. Fuel shutoff is typically managed internally within the fuel system and controlled by the car's computer, not via a manual switch.

To stop the fuel supply, you'd need to address the electrical system (by disconnecting the fuel pump relay or fuse) or, less ideally, disable the fuel pump itself. These are not simple tasks and require some mechanical aptitude. Attempting either should only be done with the engine completely off and the vehicle's electrical system disconnected.

If you need to stop the flow of fuel in an emergency (e.g., a fire), the best course of action is to call emergency services immediately.