C 1500 Truck 2WD V8-305 5.0L VIN M SFI (1997)
Technical Service Bulletin # 99-06-04-054
Date: 991101
Fuel - New CNG High Pressure Lock-Off (HPL) Procedure
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-04-054
Date: November, 1999
SERVICE MANUAL UPDATE
Subject:
New CNG High Pressure Lock-Off (HPL) Procedures
Models:
1997-98 Chevrolet and GMC Bi-Fuel (CNG) C Truck Models.
This bulletin is being issued to advise that the high pressure lock-off (HPL) is now a serviceable part and provides a repair procedure for the HPL in the
Engine Controls section of the Service Manual.
Replacement parts and the special tool J 43602 are now available.
Please remove the HPL replacement procedure on page 6-287 in the Engine Controls subsection of the Bi-Fuel C Pickup Supplement
GMT/97/98-CK-NGV and add the following new procedures.
Removal Procedure (1997 Models)
Tools Required
^
J 42435 CNG Tank Venting Kit
^
J 43602 HPL Crowfoot
^
J 42309 CNG Tank Sling
Caution:
Do not install this part if you can not completely refill the vehicle with Compressed Natural Gas (CNG) after a repair. Failure to properly leak-check
the system after the part replacement may result in serious personal injury or damage to the vehicle or the part.
1.
Remove the fuel tank cover. Refer to CNG Fuel Tank Cover Replacement in the Body Rear End subsection of the Bi-Fuel Supplement Service
Manual.
2.
Relieve the CNG fuel system pressure. Refer to Fuel Pressure Relief Procedure.
Caution:
Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless
instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect
