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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 976 (Engine Controls - 6.6L (Lb7) (Introduction)) >> Repair Instructions >> Fuel System Cleaning >> Cleaning Gasoline from the Fuel System

Cleaning Gasoline from the Fuel System

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the fuel tank.
  2. Fill the fuel tank to 1/4 full.
  3. Remove the ignition 1 relay from the underhood relay center.
  4. Loosen the fuel filter drain and connect the filter to a hose that flows into a metal container.
  5. Operate the fuel system hand primer at the fuel filter until clean fuel flows from the fuel filter drain into the metal container.
  6. Hand tighten the fuel filter drain and disconnect the hose.
  7. Install a hose on the fuel return line near the glow plug relay, and insert other end into a 7.6 liters (2 gallon) metal container.
  8. Crank the engine for 30 second time intervals, with 1 minute cool down periods. Continue until 3.8 liters (1 gallon) of fuel has passed into the container.
  9. Reconnect the fuel return line.
  10. Install the ignition 1 relay into the underhood relay center.
  11. Attempt to start and run the engine for 15 minutes (If engine does not start, operate the hand primer for 30 strokes, or until firm).
  12. Stop the engine.
  13. Clean any fuel spillage from the engine.
  14. Clear the engine of any diagnostic trouble codes (DTCs).
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