Fuel Delivery and Air Induction: Service and Repair

Fuel System Cleaning

Special Tools

* J 34730-1A - Fuel Pressure Gauge

* J 37088-A - Fuel Line Disconnect Tool Set

Warning: Refer to Battery Disconnect Warning Service Precautions.


1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (LS7 or LS9) Battery Negative Cable Disconnection and ConnectionBattery Negative Cable Disconnection and Connection (LS3) Battery Negative Cable Disconnection and Connection.

2. Relieve the fuel system pressure. Refer to the Fuel Pressure Relief (Without CH 48027) Fuel Pressure Relief (Without CH 48027)Fuel Pressure Relief (CH 48027) Fuel Pressure Relief (CH-48027).

3. Drain the fuel tanks. Refer to Fuel Tank Draining Procedures.

4. Remove the fuel tanks.

* For the left fuel tank, refer to Fuel Tank Replacement - Left Side Fuel Tank Replacement - Left Side.

* For the right fuel tank, refer to Fuel Tank Replacement - Right Side Fuel Tank Replacement - Right Side.

5. Remove the fuel sender assemblies.

6. Inspect the left fuel sender strainer. Replace a contaminated strainer for the left fuel sender only, and inspect the fuel pump.

7. Inspect the left fuel sender fuel pump inlet for debris. Replace the left fuel sender assembly if you find debris in the fuel pump inlet.

8. Inspect the right fuel sender strainers. Replace the right fuel sender assembly if you find a contaminated strainer. The right fuel sender strainers are not serviced separately.

Note: When flushing the fuel tanks, handle the fuel and water mixture as a hazardous material. Handle the fuel and water mixture in accordance with all applicable local, state, and federal laws and regulations.

9. Flush the fuel tanks with hot water.

10. Pour the water out of the fuel sender assembly openings. Rock the tanks to be sure that removal of the water from the tanks is complete.

11. Install the fuel sender assemblies.

12. Install the fuel tanks.

* For the left fuel tank, refer to Fuel Tank Replacement - Left Side Fuel Tank Replacement - Left Side.

* For the right fuel tank, refer to Fuel Tank Replacement - Right Side Fuel Tank Replacement - Right Side.

13. Refill the fuel system.

14. Install the fuel filler cap.

15. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (LS7 or LS9) Battery Negative Cable Disconnection and ConnectionBattery Negative Cable Disconnection and Connection (LS3) Battery Negative Cable Disconnection and Connection.

16. Perform the following procedure in order to inspect for leaks:

1. Turn the ignition switch ON for 2 seconds.

2. Turn the ignition switch OFF for 10 seconds.

3. Turn the ignition switch ON.

4. Inspect for fuel leaks.

17. Program the transmitters. Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming (without XL8 or Z49) Remote Control Door Lock and Theft Deterrent Transmitter Programming (without XL8 or Z49)Remote Control Door Lock and Theft Deterrent Transmitter Programming (with XL8 or Z49) Remote Control Door Lock and Theft Deterrent Transmitter Programming (with XL8 or Z49)Remote Control Door Lock and Theft Deterrent Transmitter Programming (New RCDLR ONLY) Remote Control Door Lock and Theft Deterrent Transmitter Programming (New RCDLR ONLY).