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
190
CNG FUEL MODULE MAINTENANCE AND PART REPLACEMENT (CONTINUED)
I. Transit Fill Receptacle Replacement Procedure (Continued)
CAUTION
Allow pressure to bleed down completely before removing the receptacle.
6. It is recommended that the O-ring (SAE size 10) on the fitting be replaced.
7. Remove and discard the old O-ring.
8. Thoroughly clean the area of dirt and debris.
9. Lubricate the new O-ring with a small amount of approved lubricant (See Section B) .
10.Using an O-ring torpedo, install the new, lubricated O-ring on the corresponding fitting.
CAUTION
To avoid leaks, prevent any damage or cuts to the new O-ring that may occur with contact between the fitting and the O-
ring.
11.Install the new receptacle onto the corresponding fitting. Using a 1-1/16” cylinder wrench to support the flats of the
fitting. Torque the receptacle to 48 ft. lbs.
12.Ensure the dust cap on the new receptacle is in the original position.
13.Slowly OPEN one (1) supply tank valve.
CAUTION
Test the receptacle with the leak detector before opening all tank valves. If a leak is detected, check for debris and/or
replace the O-ring.
14.If a leak is detected, follow steps in Preparation before Maintenance to relieve pressure in the unit.
15.Repair the leak and retest with leak detector.
16.Open remaining tank valves if no leak is detected.
17.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".
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