Fuel Filter Replacement 4.8L, 5.3L, and 6.0L Engines

Important: Clean the fuel filter connections and surrounding are before disconnecting the fuel lines in order to avoid possible fuel system contamination.

1. Relieve the fuel system pressure. Refer to the Fuel Pressure Relief .
2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Clean the fuel filter connections.
4. Using a flare nut wrench and backup wrench, loosen the fuel lines (1) from the fuel filter.
5. Remove the fuel filter outlet line from the retainer and reposition the line out of the way.
6. Slide the fuel filter out from the bracket.
7. Inspect the fuel line O-rings for cuts, nicks, swelling, or distortion. Replace the O-rings if necessary.
8. If a restricted fuel filter is found, clean the entire fuel system. Refer to Fuel System Cleaning .

1. Slide a NEW fuel filter into the bracket.
2. Position the fuel filter outlet line and install it to the retainer.
3. Tighten the fittings by hand until snug.

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. Using a flare nut wrench and backup wrench, tighten the fuel lines (1).

Tighten
Tighten the fittings to 25 N·m (18 lb ft).

5. Lower the vehicle.
6. Install the fuel fill cap.
7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
8. Perform the following in order to inspect for fuel leaks:

8.1.	Turn the ignition to ON, with the engine OFF, for 2 seconds.

8.2.	Turn the ignition to OFF for 10 seconds.

8.3.	Turn the ignition to ON, with the engine OFF.

8.4.	Inspect for fuel leaks.

Fuel Filter Replacement 5.3L (L59) Engine

Tools Required

J-46363 Fuel Line Release Tool

1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information
3. Remove the fuel composition sensor bracket nuts.



4. Reposition the fuel composition sensor/bracket off to the side.



5. Using a flare nut wrench and backup wrench disconnect the fuel line fitting from the fuel filter.
6. Pull the quick connect fitting back until the internal retainers hit the filter stop.



7. Twist one end of J-46363 and insert it between the fitting and the filter.



8. Twist the opposite end of J-46363 and insert it between the fitting and filter.



9. Once J-46363 is inserted, ensure that J-46363 is parallel to the filter and fitting.



10. While holding the filter, push the fitting towards the filter in order to disconnect the quick connect fitting.
11. Remove the fitting from the filter.
12. Remove J-46363 from the filter.



13. Remove the fuel filter from the bracket.

1. Install the NEW fuel filter to the bracket.



2. While holding the filter, push the fitting towards the filter in order to connect the quick connect fitting.



3. Using a flare nut wrench and backup wrench connect the fuel line fitting to the fuel filter.

Notice: Refer to Fastener Notice in the Preface section.




4. Position the fuel composition sensor/bracket into place.
5. Install the fuel composition sensor bracket nuts.

Tighten
Tighten the nuts to 17 N·m (13 lb ft).

6. Lower the vehicle.