Yukon 2WD V8-5.7L VIN R (1997)
Tighten
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Tighten the fuel line fitting (3) to 24 N.m (18 lb ft).
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Tighten the fill line fitting (1) to 37 N.m (27 lb ft).
20.
Connect the following connectors:
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High pressure lock-off (HPL) (1)
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Fuel sending unit (FSU) (2)
Caution:
The high pressure lock-off solenoid seal is more likely to leak at a lower pressure. Always perform the fuel leak procedure exactly as specified.
Failure to follow the proper procedures may result in serious personal injury or damage to the vehicle or part.
21.
Fuel the vehicle in three stages at the following pressures:
21.1. 3,447 kPa (500 psi)
21.2. 10,342 kPa (1500 psi)
21.3. 20,685 kPa (3000 psi)
22.
Using the J 41416 Ultrasonic Leak Detector, inspect for fuel leaks at the HPL at EACH pressure.
23.
Connect the negative battery cable.
24.
Start and operate the engine on CNG.
25.
Inspect for fuel leaks at each serviced fitting using the J 41416.
26.
Attach the information label supplied with the replacement HPL in a visible location on the head of the tank.
27.
Install the tank cover. Refer to Fuel Tank Cover Replacement in Body Rear End subsection of the Bi-Fuel Supplement Service Manual.
Removal Procedure (1998 Models)
Tools Required
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J 42435 CNG Tank Venting Kit
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J 43602 HPL Crowfoot
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J 42309 CNG Tank Sling
