If pressing the engine stop button does not stop the engine, your fuel solenoid may be frozen open, or the stop circuit may be faulty.
1. Check the fuel solenoid. If the piston plunger valve rack is extended, the solenoid is open and providing fuel. This is the “normal” un-energised position (energise to stop).
2. Jumper the solenoid terminal (S42, Grey /w Yellow stripe) to ground. The piston should retract, closing off fuel. Ensure that the piston (plunger rack) re-extends to the run position.
If not, tap gently to free it loose to close.
If not, replace solenoid.
It is very important to ensure that the piston is fully bottomed when final linkage is connected. If the solenoid is restricted from bottoming out in the retract/energized mode then it will burn out in approximately 30 seconds. Insufficient current
will also result in failure.
TEST PROCEDURE TO DETERMINE PLUNGER HAS BOTTOMED:
On units with an auxiliary third terminal, connect a voltmeter or appropriate light (voltage rating) between auxiliary and "+" terminals. When the solenoid is energized and the piston bottoms (retracts), the voltmeter will indicate the battery
voltage or the light is energized.
Push the piston to the full bottomed (retracted) position and measure the plunger extension length from the solenoid body before the linkage is connected. Connect linkage and energize the solenoid. If the piston has fully bottomed, the piston extension lengths should be the same.