Close the manual valves of all the fuel cylinders. Disconnect the electric system harness connector from the tank valve. Before checking the system, make sure to close the fuel cylinder valve.Close the valve in the maintenance procedure provided by its manufacturer.Before starting the work, check all the cylinders, and close all the valves.Do not close the manual shutoff (1/4 turn) valve.② Lower the fuel pressure by letting the engine run until it stops.③ Close the manual shutoff (1/4 turn) valve.
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