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.

2004 Chevrolet Avalanche 2500FACTORY OEM SERVICE PROCEDURE

Installation Procedure

Fig 1: View Of Vapor Line Quick Connect Fittings (Rear Tank)

Courtesy of GENERAL MOTORS CORP.

Install a NEW fuel tank module seal onto the fuel tank.
Position the fuel tank module part way into the fuel tank.
Connect the vapor line quick connect fittings, to the module. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
Install the module into the fuel tank.
Place the lock ring into position.

Fig 2: Rotating Lock Ring Using J 45722 (Rear Tank)

Courtesy of GENERAL MOTORS CORP.

Factory Service Tools

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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.