An ACDelco GM Original Equipment Fuel Shut-off Valve is part of your vehicle's diesel injection system, and is a GM-recommended replacement for your vehicle's original component. The fuel shut-off valve is electrically operated and, when deactivated, it interrupts the fuel injection to shut off the engine. This original equipment fuel shut-off valve has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.