To disable the fuel supply, you would need to:
1. Consult your owner's manual: This is the best place to start. While it likely won't mention a fuel shut-off switch, it may detail the location of relevant fuses or relays.
2. Locate the fuse box(es): The 2002 Mondeo likely has several fuse boxes – one in the engine bay and possibly one inside the cabin. Check the diagrams inside the fuse box covers to identify the fuel pump relay or fuse. The exact location and labeling will vary slightly depending on the engine and trim level.
3. Disconnect the relay or fuse: Once you've found the correct one (it will be clearly labeled, often with "fuel pump"), carefully remove it. This will prevent fuel from reaching the engine.
Warning: Disconnecting the fuel pump relay or fuse is only recommended in emergency situations, such as a fire. Incorrectly disconnecting components could lead to further damage or safety hazards. If you're unsure about any of these steps, consult a qualified mechanic.