GM Service Manual Online
For 1990-2009 cars only
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Attach a small piece of hose to the drain cock onto the water-in-fuel sensor.
  3. Place an approved fuel-resistant container under the fuel filter.

  4. Object Number: 1663157  Size: SH
  5. Open the drain cock 3 or 4 turns or until the water contaminated fuel seeps from the drain cock.
  6. Prime the fuel system until only diesel fuel is visible. Refer to Fuel System Priming.
  7. Tighten the drain cock.
  8. Remove the container and hose.