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 fuel tank drain plug and remove drain plug.
  5. Allow fuel to drain.
  6. Caution: Refer to Fastener Caution in the Preface section.

  7. Install drain plug.
  8. Tighten
    Tighten the plug to 35 N·m (25 lb ft).