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
184
CNG FUEL MODULE MAINTENANCE AND PART REPLACEMENT (CONTINUED)
C.Procedure for Draining the Filter Bowl (Continued)
11.Open remaining tank valves if no leak is detected.
12.Check the high pressure gauge to confirm a rise in fuel pressure.
Low pressure gauge may not register pressure until vehicle ignition is turned "ON".
D.Fuel Filter Replacement Procedure
Filter Element Replacement Schedule:
Replace filter element after 40,000 miles or every 12 months, whichever comes first. Filter element replacement kits are
available from Heil (Part Number 372-8385).
Figure 36. Fuel Filter Replacement Kit
(Part Number 372-8385)
Figure 37. O-Ring Location in Inlets
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