Notice: Use care in removing the fuel injectors in order to prevent damage to the fuel injector electrical connector pins or the fuel injector nozzles. Do not immerse the fuel injector in any type of cleaner. The fuel injector is an electrical component and may be damaged by this cleaning method.

Important: The engine oil may be contaminated with fuel if the fuel injectors are leaking.

1. Remove the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement .
2. Disconnect the fuel injector harness connector from the fuel injector.
3. Remove and discard the fuel injector retainer clip (1).
4. Remove the fuel injector from the fuel rail.
5. Remove and discard the fuel injector O-ring seals (2 and 3) from the injector.

Important: When ordering new fuel injectors, be sure to order the correct injector for the application being serviced.

The fuel injector (1) is stamped with a part number identification (2). A 4 digit build date code (3) indicates the month (4), day (5), year (6), and the shift (7) that built the injector.

1. Lightly lubricate the NEW fuel injector O-ring seals (2 and 3) with GM P/N 9981704.
2. Install the NEW fuel injector O-ring seals onto the fuel injector.
3. Install a NEW retainer clip (1) to the fuel injector.
4. Push the fuel injector into the rail socket with the electrical connector end facing outward. The retainer clip locks onto the flange of the fuel rail injector socket.
5. Connect the fuel injector harness connector to the fuel injector.
6. Install the fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement .