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Home >> GMC >> 2003 >> Sierra 2500 HD, 4D Pickup Extra Cab, 6.6 1, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 6.6L >> Fuel Systems >> Fuel System Cleaning >> Cleaning Gasoline From Fuel System

Cleaning Gasoline From Fuel System

  1. Drain fuel tank.
  2. Fill fuel tank to 1/4 full.
  3. Remove ignition 1 relay from the underhood fuse/relay center.
  4. Loosen fuel filter drain and connect filter to a hose that flows into a metal container.
  5. Operate fuel system hand primer at fuel filter until clean fuel flows from fuel filter drain into metal container.
  6. Hand tighten 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 2 gallon metal container.
  8. Crank engine for 30 second time intervals with one minute cool down periods. Continue until one gallon of fuel has passed into the container.
  9. Reconnect fuel return line.
  10. Install ignition 1 relay into the underhood fuse/relay center.
  11. Attempt to start and operate engine for 15 minutes (if engine does not start, operate the hand primer for 30 strokes or until firm).
  12. Turn engine off.
  13. Clean any fuel spillage from engine.
  14. Clear any DTCs.
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