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
187
CNG FUEL MODULE MAINTENANCE AND PART REPLACEMENT (CONTINUED)
G.Defueling Receptacle Replacement Procedure
1. Follow directions in Truck Preparation to relieve pressure before performing any maintenance. 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. Remove dust cap.
Reserve dust cap for reinstall. The replacement defueling receptacle does not include a dust cap.
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 corresponding fitting. A small volume of gas may escape as this connection is loosened.
4. Once loosened, allow any built-up pressure to completely escape before removing the receptacle.
5. Install the new receptacle onto the corresponding fitting.
6. Use a 3/4” thin profile wrench to support flats on the corresponding fitting and torque receptacle to 24 ft.-lbs.
7. 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.
8. If a leak is detected, follow steps in Truck Preparation to relieve pressure in the unit.
9. Repair the leak and retest with leak detector.
10.Open remaining tank valves if no leak is detected.
11.When receptacle is satisfactorily replaced with no leaks, reinstall dust cap.
Figure 40. Defueling
Receptacle
182
182
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