GM Service Manual Online
For 1990-2009 cars only
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the fuel fill cap.
  3. If not equipped with a drain plug, using a hand or air operated pump, drain as much fuel through the fuel fill pipe as possible.
  4. If equipped with a drain plug, position a suitable container under the fuel tank drain plug and remove the drain plug.
  5. Allow the fuel to drain.
  6. Notice: Refer to Fastener Notice in the Preface section.

  7. Install the drain plug.
  8. Tighten
    Tighten the drain plug to 35 N·m (26 lb ft).