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
186
CNG FUEL MODULE MAINTENANCE AND PART REPLACEMENT (CONTINUED)
E. Fuel Module Receptacle O-Ring Replacement Procedure (Continued)
The O-ring seals, located in the inlets of the two (2) fueling receptacles, can wear or become damaged over time and
with repeated use. If damaged, a leak may occur when fueling.
Procedure to replace O-ring:
1. Carefully remove the worn O-ring.
CAUTION
Avoid damaging the inner surface of the O-ring groove.
2. Damage on the inner surface of the O-ring groove may result in a permanent leak and require replacement of the
fueling receptacle.
3. Clean area of dirt or debris.
4. Lubricate the new O-ring with approved lubricant (See Section B) .
5. Install new O-ring into the O-ring groove, being careful not to damage either the new O-ring or the O-ring groove.
F. Fuel Module Receptacle Replacement Procedure
The fuel receptacles are threaded into fittings that are mounted into the manifold going through the face plate of the fuel
module and are equipped with an O-ring that seals the connection. When purchasing any replacement receptacles, Heil
recommends that any exposed O-rings be replaced to avoid leaking from damaged or worn O-rings.
Figure 39. Defueling Receptacle, NGV1 Receptacle and
Transit Fill Receptacle Locations
183
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