If you need to disable the fuel system for safety or other reasons, you'd need to either:
* Disconnect the negative battery cable: This is the safest and easiest method for an immediate fuel shutoff. Locate the battery (usually under the hood) and disconnect the negative (black) cable.
* Locate the fuel pump relay: This requires a bit more mechanical knowledge and access to your vehicle's wiring diagrams to identify the correct relay. Removing the relay will prevent the fuel pump from operating.
Caution: Disconnecting the battery or the fuel pump relay will disable other vehicle systems, not just the fuel system. It's crucial to understand the implications before attempting either of these actions.