GM Service Manual Online
For 1990-2009 cars only

Important: Both the primary and the secondary filters must be drained of water if the Water In Fuel lamp is illuminated.

  1. Turn the engine OFF.
  2. Apply the parking brake.
  3. Loosen the fuel filler cap.

  4. Object Number: 64313  Size: SH
  5. Attach a flexible tube or hose (1/4 to 5/16 in. I D) to the water drain.
  6. Place a suitable container under the filter drain.

  7. Object Number: 64302  Size: SH

    Important: Verify that the ignition is in the OFF position before opening the water drain.

  8. Slowly open the water drain valve.
  9. Allow filter to drain until clear fuel is observed.
  10. Close the drain valve.
  11. Start the engine.
  12. If the Water in the Fuel lamps comes On again, repeat procedure until all of the water is drained from the primary and secondary fuel manager/filters (if water in the fuel lamp keeps coming ON, the fuel tank should be checked for contamination).
  13. Dispose of the drained mixture in a proper manner.