Fuel Injector: Service and Repair

REMOVAL PROCEDURE

NOTE: 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 fuel injector is serviced as a complete assembly only. If the fuel injectors are found to be leaking the engine oil may be contaminated with fuel.

1. Relieve the fuel pressure. Refer to Fuel Pressure Release.




2. Remove the fuel rail assembly.




3. Remove the fuel injector retaining clips (2).
4. Remove the fuel injectors (3).
5. Remove the upper fuel injector O-ring (1).
6. Remove the lower fuel injector O-ring (5).

IMPORTANT: The fuel injector O-rings should always be replaced whenever fuel injectors are serviced.

Each fuel injector is calibrated for a specific flow rate. Be sure to use the correct part number when ordering replacement fuel injectors.

The lower fuel injector O-ring (5) uses a nylon collar, called the O-ring backup (4), to properly position the O-ring on the fuel injector. Be sure to reinstall the O-ring backup, or the sealing O-ring may move on the fuel injector when installing the fuel rail. If the sealing O-ring is not seated properly, a vacuum leak is possible and driveability complaints may occur.

7. Remove the O-ring backup (4).

INSTALLATION PROCEDURE

IMPORTANT:
^ When ordering new fuel injectors, be sure to order the correct injector for the application being serviced.
The upper and lower fuel injector O-rings use different part numbers. To identify the correct O-ring, the upper O-ring is black and the lower O-ring is brown. Both O-rings are the same size but consist of different material. The lower fuel injector O-ring uses a nylon collar, called the O-ring backup, to properly position the O-ring on the injector. Always reinstall the O-ring backup, or the sealing O-ring may move on the injector when installing the fuel rail and result in a possible vacuum leak.
^ Fuel injector O-rings should always be replaced whenever fuel injectors are serviced.




1. Coat all new O-rings with engine oil before installing
2. Install the back up fuel injector O-ring (4).
3. Install the lower fuel injector O-ring (5).
4. Install the upper fuel injector O-ring (1).
5. Install the fuel injector to the fuel rail (3).
6. Install the fuel injector retaining clips (2).




7. Install the fuel rail assembly.
8. Install the fuel injector sight shield.