* Fuel Pump Inertia Switch: This is a safety device that cuts power to the fuel pump in the event of a collision. It's usually located under the hood, often near the battery or in a readily accessible location (consult your owner's manual for its exact location). This is *not* an easily accessible "emergency" shut-off for everyday situations but is a crucial safety feature.
* Interrupting Power to the Fuel System: To completely shut off the fuel supply in an emergency, you'd have to disconnect the battery's negative terminal (ground cable). This is a more drastic measure, as it disables all electrical systems.
Important Note: Your 2005 F350 owner's manual is the definitive source for the location of the inertia switch and other safety features. Consult it for precise details. Never attempt to disable the fuel system in a way not specified by the manufacturer unless absolutely necessary for safety reasons.