21 Rev-13 Nov 23, 2020
NATURAL GAS & LPG FUEL LOCK-OFF VALVES
Due to the many variances of Fuel Lock-Off valves, if
replacement is necessary, please contact ZPP Parts Sales to
assure proper application and fitment.
The fuel lock-off valve is located between the final stage
regulator and NG fuel supply line or LPG supply. The Engine
Control Module (ECM) opens the fuel lock-off when the ECM
detects engine speed from the CRANK sensor during
cranking. The ECM turns off the fuel lock-off when the key
switch is turned off or the ECM shuts down the engine for low
oil pressure, low coolant level or engine overheat.
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