Fuel shut-off solenoids often are used on diesel engines to interrupt
fuel flow from the injection fuel pump when the ignition is switched
off. On start-up of the engine, a solenoid pull-in coil must be
temporarily activated to turn on the solenoid. If the key is held at the
start period for an extended period of time or if the key sticks in the
start position, the solenoid will overheat and can burn out and fail.