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 Fuel Injector, Clip & O-Rings

Courtesy of GENERAL MOTORS CORP.

Lubricate NEW lower injector O-ring seals (4) with clean engine oil.
Install the NEW O-ring seals (4) onto the spray tip end of each injector (3).

Fig 2: View Of Fuel Injection Rail

Courtesy of GENERAL MOTORS CORP.

Factory Service Tools

Use the Manual With the Right Hardware

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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.