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
182
PREPARATION BEFORE MAINTENANCE
It is necessary to prepare the truck to be serviced. A mechanic’s initial focus while preparing the vehicle for service should
be safety. The primary preparation involves relieving the pressure within the system BEFORE performing any maintenance
procedures.
Follow the steps as outlined below to ensure that no pressure remains.
1. Leave the Fuel Management Module Manual Shut-Off Valve in the Open "O" position.
2. Turn OFF each supply Tank’s valve(s) inside CNrG Tailgate.
3. Start the vehicle's engine, allowing it to run until the engine shuts off. This will ensure that all CNG in the lines has
been consumed.
4. As an added safety precaution, open the system purge valve to ensure no latent pressure remains.
5. Ensure the high pressure gauge on the fuel control module reads 0 psi.
6. Turn off the power supply if an electrical component of the system requires service.
7. Perform any maintenance ONLY after completing these instructions.
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