Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
3. Remove the upper intake manifold assembly. Refer to Intake Manifold Replacement in Engine Mechanical -- 4.3L.
4. Remove the fuel meter body assembly. Refer to Fuel Meter Body Assembly Replacement .
5. Remove the injector assembly retainer (11) and the injector retainer lock nuts (10).

Notice: Use care in removing the fuel injectors to prevent damage to the electrical connector terminals.

The fuel injector is serviced as a complete assembly only.
Also since the injectors are electrical components, these injectors should not be immersed in any type of liquid solvent or cleaner as damage may occur. Fuel injector cleaning is not recommended.
6. While pulling the poppet nozzle tube downward, push with a small tip punch down between the injector terminals until the injector is removed.

Important: Each injector is calibrated for a specific flow rate. Order the correct injector for the application being serviced when replacing the fuel injectors.

1. Lubricate the new injector O-ring seals with clean engine oil.
2. Install the O-rings on the injector assembly (2).



3. Install the fuel injector assembly (12) into the injector socket.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the injector assembly retainer (11) and the injector retainer lock nuts (10).

Tighten
Tighten the lock nuts to 3.0 N·m (27 lb in).

5. Install the fuel meter body assembly. Refer to Fuel Meter Body Assembly Replacement .
6. Install the upper intake manifold assembly. Refer to Intake Manifold Replacement in Engine Mechanical -- 4.3L.
7. Tighten the fuel filler cap.
8. Connect the negative battery cable.
9. Inspect for leaks:

9.1.	Turn the ignition switch ON for 2  seconds.

9.2.	Turn the ignition switch OFF for 10 seconds.

9.3.	Turn the ignition switch ON.

9.4.	Inspect for fuel leaks.