Relieve the high side fuel system pressure. Refer to Fuel Pressure Relief (Without CH-48027) , Fuel Pressure Relief (CH-48027) , Fuel Pressure Relief (High Side) .

NOTE:

The fuel injectors have an alignment feature, note the position of the injectors alignment for installation.

Remove the fuel injection fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (LLT) , or Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LLT) .

Fig 1: Identifying Fuel Injector Retaining Rings

Courtesy of GENERAL MOTORS COMPANY

Fig 2: Identifying Direct Fuel Injector & Harness Assembly

Courtesy of GENERAL MOTORS COMPANY

Remove the direct fuel injectors and harness (1) as an assembly, and disconnect the electrical connector (2). If necessary, use the J 2619-01 slide hammer with the J-37281-A injector remover in order to remove the direct fuel injectors evenly.

Fig 3: Identifying Fuel Injector Components

Courtesy of GENERAL MOTORS COMPANY

Remove and discard the following components from the fuel injectors (4).
- Upper O-ring Seal (1)
- Plastic Spacer (2)
- Retaining Ring (3)
- Isolator Cup (5)
- Teflon Seal (6)
Inspect the fuel rail injector bores and clean with the J-39313 adapter , and EN-47909 cleaning kit , if required.

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.

Safety Warning

Removal Procedure