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Home >> GMC >> 1994 >> Forward Control 5.7 K, L05, Automatic >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Fuel System (Diesel) >> Water-In-Fuel Warning Light
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Water-In-Fuel Warning Light

  1. Fuel filter should be drained every 5000 miles, or when WATER-IN-FUEL warning light comes on. Diesel fuel can damage asphalt and painted surfaces. Always place a drain pan under drain hose to collect fuel.
  2. Stop vehicle and turn engine off. Apply parking brake. Remove fuel tank cap. Open water drain valve 2-3 turns. Start and allow engine to idle for 2 minutes or until clear fuel is observed. Turn engine off and close water drain valve.
  3. Install fuel tank cap. If WATER-IN-FUEL warning light comes on after driving a short distance, or if engine runs rough or stalls, a large amount of water may be present in fuel tank. Purge fuel system. See PURGING FUEL SYSTEM  under FUEL SYSTEM (DIESEL).
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