Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 483 (ENGINE CONTROLS - 6.0L - ALTERNATIVE FUELS (INTRODUCTION))REPAIR INSTRUCTIONSHIGH PRESSURE LOCK-OFF (HPL) SOLENOID REPLACEMENTINSTALLATION PROCEDURE

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Installation Procedure

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Natural gas is stored under high pressure. If a leak occurs, the high pressure could cause a personal injury. In order to prevent Compressed Natural Gas (CNG) fuel leaks, always replace the CNG fuel system O-rings during service.

Install the NEW O-ring on the HPL.
Lubricate the O-ring with petroleum jelly.
Ensure that the O-ring mating surface of the tank is clean and free of debris or damage.
Install the HPL in the tank and tighten hand-tight.
Do not install the fuel line fittings.

Proceed directly to Step 9 for vehicles equipped with the ZW9 option.

Fig 1: Positioning CNG Tank Support Harness

Courtesy of GENERAL MOTORS CORP.

Lower the fuel tank (2) into the tank mounting frame ensuring that the high pressure lock-off solenoid is properly oriented to the fuel line.

Fig 2: Identifying Tank Strap Retaining Components

Courtesy of GENERAL MOTORS CORP.

Place the straps around the tank.
Install the tank strap upper mounting pins (1) and clips (6).

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the tank strap mounting nuts (5).
Tighten: Tighten the tank strap mounting bolts to 47 N.m (35 lb ft).

Fig 3: Tightening HPL

Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.