The fuel cut-off stop solenoid valve opens and closes the fuel passage leading to the suction port of the pump. The valve can be either energised to run or de-energised to run depending on application.

When voltage is applied to the solenoid, the valve either opens or closes the suction port. If your solenoid has failed it can prevent the engine from running or prevent it from switching off.

Advance solenoids control the timing of the pump electronically via a control circuit or ECU.

Anti-theft solenoids are available as a retro-fit to enable immobilisation of a vehicle by preventing fuel reaching the injection pump, ideal for vehicles such as early Land Rovers with very little built in security.