Where is the fuel cut off switch on a 1993 Ford Econoline with 4.9?

There isn't a readily accessible, single "fuel cut-off switch" like you might find on some vehicles on a 1993 Ford Econoline with a 4.9L engine. Fuel delivery is controlled electronically and mechanically through the fuel pump relay, the fuel pump itself, and the injection system. There's no simple on/off switch.

To stop the engine, you'd simply turn the ignition key to the "off" position. To disable the engine in an emergency situation, your best bet would be to:

* Disconnect the battery's negative terminal. This will cut all power to the engine, including the fuel pump. This is the safest and most reliable way to stop fuel flow in an emergency.

* Pull the fuel pump relay. Locating the relay box (often under the hood or in the passenger compartment) and pulling the appropriate relay will stop the fuel pump from working. This requires some mechanical knowledge to identify the correct relay. Consult your owner's manual or a wiring diagram.

Keep in mind that disconnecting the battery or pulling the fuel pump relay should only be done in emergency situations. Disconnecting the battery will disable other critical electrical systems.