1998 Cadillac Eldorado Owner's Manual - Page 286

The cap is behind a hinged door on the driver's side of your vehicle. The fuel door releaseis located on console and on the Remote Keyless Entry (RKE) transmitter. An alternate fuel door release is located insideof the trunk on the left hand side. Pull it to release the fuel door. While refueling, hang'the cap by the tether from the hook on the filler door. To remove the cap, turn it slowly to the left (counterclockwise). The cap a spring in it; if you let has go of the cap too soon, it will spring back to the right. 6-6