2005 Cadillac DeVille Owner's Manual - Page 276

The fuel door release button is located to the left of the steering wheel next to the exterior lamp control. The button only works when the vehicle is in PARK (P) or NEUTRAL (N), the key is in the ignition and the VALET lockout button is in OFF. To remove the fuel cap, turn it slowly to the left (counterclockwise). The fuel cap has a spring in it; if the cap is released too soon, it will spring back to the right. While refueling, hang the tethered fuel cap from the hook on the fuel door. {CAUTION: If you spill fuel and then something ignites it, you could be badly burned. Fuel can spray out on you if you open the fuel cap too quickly. This spray can happen if your tank is nearly full, and is more likely in hot weather. Open the fuel cap slowly and wait for any hiss noise to stop. Then unscrew the cap all the way. An alternate fuel door release is located inside of the trunk on the driver's side of the vehicle. Pull it to release the fuel door. 5-8