Half/Pack
®
Issued April 2018
Compressed Natural Gas (CNG) Option
Copyright 2018, Heil Environmental
Printed in the U.S.A.
Compressed Natural Gas (CNG) Option
188
CNG FUEL MODULE MAINTENANCE AND PART REPLACEMENT (CONTINUED)
H.NGV1 Receptacle Replacement Procedure
1. Follow directions in Truck Preparation to relieve pressure before performing any maintenance.
CAUTION
A check engine light or fault code may illuminate if the gas pressure is too low. This should resolve when gas pressure is
restored.
2. Slide the portion of the dust cap that wraps around the fuel receptacle away from the face plate to expose the flats on
the fuel receptacle.
3. Use a 3/4” thin profile wrench to support flats on the corresponding fitting. Use a second 3/4” wrench to loosen the
receptacle from the fitting. A small volume of gas may escape as this connection is loosened.
4. Once loosened, allow any built-up pressure to completely escape. Remove the receptacle.
5. It is recommended that the O-ring (SAE size 6) on the fitting be replaced.
6. Remove and discard the old O-ring.
7. Remove any dirt or debris from the area.
8. Lubricate a new O-ring with a small amount of approved lubricant (See Section B) .
9. Using an O-ring torpedo, install the new, lubricated O-ring on the corresponding fitting.
Figure 41. NGV1 Receptacle
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