Printed in U.S.A.
CNG FUEL SYSTEM COMPONENTS
(CONTINUED)
C.CNG Fuel System Components (Continued)
2. Cylinder Manual Shut-Off Valve
The cylinder Manual Shut-Off Valve attached to each
cylinder controls the flow of gas in and out of the
cylinder. Each valve is located under a valve access
cover labeled "MANUAL SHUTOFF VALVE" that is
adjacent to the cylinder. Turn the valve handle
FULLY clockwise to close the valve or FULLY
counter-clockwise to open it.
3. Check Valve
The 1-way check valve, located in the FMM box, is
used to prevent fuel from backing up during the fuel
filling process.
4. High Pressure Filter
The high pressure coalescing filter is used to remove
contaminants and oil from the fuel prior to it entering
the low pressure portion of the fuel system.
5. Low Pressure Filter
The low pressure filter is located on the frame near
the engine. The low pressure filter is used to remove
contaminants and oil from the fuel prior to it entering
the engine. See to the engine manufacturer’s
recommended instructions for maintenance and
replacement.
6. Pressure Regulator
The pressure regulator reduces the pressure of fuel
in the system from high pressure (3,600 psi) to low
pressure (70-100 psi for the Momentum FMM) for the
engine to use. Coolant from the engine circulates
through the regulator to keep it from freezing. Also
see High Pressure Gauge and Low Pressure
Gauge .
7. Solenoid Valve
The solenoid valve allows pressure to flow from the
regulator inlet port to the outlet port when the ignition
is on.
8. Bleed Valve
The bleed valve vents residual pressure in the FMM
portion of the system to allow for maintenance
procedures and purging. The bleed valve is the only
fitting that it is safe to open while under pressure.
The Bleed Valve shall not be used to defuel the system.
The system must be defueled before using the bleed
valve. See Transfer Fueling (Defueling) section.
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