There isn't a readily accessible, easily-located fuel shutoff switch on a 2005 Ford F-150 like you might find on some older vehicles. The fuel system is controlled electronically. To stop the flow of fuel, you would need to disconnect the fuel pump's electrical connection (which requires mechanical skills and knowledge of your truck's specific fuel system components and location, potentially involving working near fuel lines —
extremely dangerous if done incorrectly). This is
not a simple procedure and should only be attempted by someone with significant automotive experience.
In short, there is no easily accessible fuel shut-off switch. The safest way to stop the flow of fuel is to turn the ignition off.
