Fuel Tank Shutoff Valve
The fuel tank shutoff solenoid valve (Fig 1) is located in the fuel tank. The solenoid valves are on the same circuit as the gasoline fuel pump and utilize the same Inertia fuel shutoff (IFS) switch as gasoline. When the key is in the off position, the shutoff valves are closed and fuel in the tanks is isolated. During refueling, the shutoff valve acts as a check valve and allows flow due to pressure differential between the fuel being added from the fill station and the fuel in the tank.
The internal solenoid valves also have the capability of being "manually locked down." If, while servicing the vehicle, it becomes necessary to remove the fuel tank, the lock down feature provides an added measure of safety. In addition, the valve has an internal Canadian Gas Association (CGA) type 9 fusible link pressure relief device (PRD) that senses the internal fuel tank gas temperature. The contents in the tank are vented when the internal fuel tank gas temperature reaches 103°C (217°F) and melts the fusible link. The escaping gas is vented through a vent line to the atmosphere.