Fuel System Cleaning

TOOLS REQUIRED: 

• 7000081-SAT3 Tech-2
• SA9127E-7 Fuel Flow/Pressure Adapter

After it is determined that the fuel system is contaminated, the following procedure to clean it is recommended:

1. Place vehicle on hoist and open hood.
   Fig 1: Placing Vehicle On Hoist

   Courtesy of GENERAL MOTORS CORP.
2. Disconnect negative battery cable.
3. Drain fuel tank. Refer to FUEL TANK DRAINING .
   Fig 2: Draining Fuel Tank

   Courtesy of GENERAL MOTORS CORP.
4. Remove fuel tank. Refer to FUEL TANK .
5. Disconnect fuel feed line at engine.
   Fig 3: Fuel Feed Line

   Courtesy of GENERAL MOTORS CORP.
6. With compressed air, blow out fuel feed line. Catch fuel in a container at opposite end of line.
7. Remove EVAP canister from fuel tank. Refer to EVAP CANISTER VENT SOLENOID .
8. Remove pump module. Refer to FUEL PUMP MODULE .
9. Inspect inlet filter on pump. If plugged or damaged, the entire fuel pump module must be replaced (not serviced separately).
10. Flush tank with hot water for at least six minutes; invert and drain. All metal chips/debris must be removed from the tank prior to installation.
11. Install EVAP canister to fuel tank.
12. Install fuel pump module to fuel tank but do not connect fuel feed line to new filter/regulator.
13. Install fuel tank to vehicle.
14. Install fuel filler pipe to vehicle.
    Fig 4: Fuel Filler Pipe

    Courtesy of GENERAL MOTORS CORP.
    NOTE: Replace the plastic fuel line retainers whenever the fuel supply lines are disconnected at the fuel filter/pressure regulator and fuel rail. Install the new retainer into the female portion of the connection. Care must be taken to assure that the locking tab is centered in the window of the female connection. Firmly press the male and female portions together until a "click" is heard, then pull firmly back to confirm engagement.
15. Connect fuel feed line to fuel rail.
16. Put at least 23 L (6 gal) of clean fuel into fuel tank.
17. Connect negative battery cable.

    Torque: 

    Battery Terminal Bolts: 17 N.m (13 ft-lbs) 

18. Connect Tech-2 7000081-SAT3 to vehicle and turn ignition On.
    Fig 5: Fuel Pump Module

    Courtesy of GENERAL MOTORS CORP.
19. Raise vehicle on hoist and (1) install 5/16" male quick connect adapter (from Fuel Flow/Pressure Adapter SA9127E-7) into fuel feed line.
    Fig 6: Installing Quick Connect Adapter

    Courtesy of GENERAL MOTORS CORP.
20. Install drain hose to adapter and place other end in a suitable container.
21. Energize fuel pump with the Scan tool. Refer to ENERGIZING THE FUEL PUMP  for one to two minutes. This will pump about 2 1 (2 qt.) of fuel and purge any debris in the fuel pump.
    NOTE: Replace the plastic fuel line retainers whenever the fuel supply lines are disconnected at the fuel filter/pressure regulator and fuel rail. Install the new retainer into the female portion of the connection. Care must be taken to assure that the locking tab is centered in the window of the female connection. Firmly press the male and female portions together until a "click" is heard, then pull firmly back to confirm engagement.
22. Disconnect fuel drain hose adapter at fuel feed line and connect fuel feed line to fuel filter/regulator.
23. Energize fuel pump and check all connections for leaks.
24. De-energize pump, lower vehicle, and start engine.
25. Perform the "Service Bay Diagnostic Test" for the evaporative emission system using the Scan tool. This test will verify the integrity of the vapor handling areas of the fuel system.