Issued June 2020
Compressed Natural Gas (CNG) Option
Copyright 2020, Heil Environmental
Printed in U.S.A.
223
DEPRESSURIZING PROCEDURE
(CONTINUED)
9. Turn OFF the power supply if an electrical
component of the system requires service.
10.Perform any maintenance ONLY after completing
these instructions.
Once this process is complete, the system will be fully
depressurized up to the primary solenoid lock-off valve.
Pressure may still remain downstream of the solenoid
valve, including inside the fuel cylinder(s). Use care when
loosening fittings for the first time. Be aware that it is
normal for a small amount of gas to leak out of any fitting
downstream of the solenoid lock-off valve.
RE-PRESSURIZING PROCEDURE
Once the high-pressure filter drain or change procedure is
complete, perform the following procedure to re-pressurize
the lines.
1. Make sure that the vehicle is OFF. Take the keys out
of the ignition.
2. Close the bleed valve and torque the fitting to 4-5 FT-
LBS.
3. Check that the filter bowl and the drain plug are
installed and tightened.
4. Check that the FMM Manual Shut-Off Valve is in the
ON position.
5. On each cylinder, slowly turn the cylinder Manual
Shut-Off Valve by turning the valve counter-clockwise
to the ON position.
6. Re-install the fill panel cover (if removed).
7. Insert the ignition key and start the engine.
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