Cut-Off/Inertia Switch: Description

Some fuel injected models use an electrical interrupt switch in the fuel system. On General Motors vehicles, if equipped, it is known as a cut-off switch, and is located in the oil pressure sending unit in conjunction with the fuel pump relay. The inertia switch disables the fuel delivery system when the vehicle is struck violently or when vehicle roll-over takes place. It is mounted in various locations, depending on the vehicle model.