2003 Cadillac DeVille Owner's Manual - Page 278

Filling Your Tank - The fuel cap is located behind a hinged door on driver's side of your vehicle. The fuel door release button is located to the left of the steering wheel next to the exterior lamp control Fuel vapor is highly flammable. It burns violently, and that can cause very bad injuries. Don't smoke if you're near fuel or refueling your vehicle. Keep sparks, flames and smoking materials away from fuel. The button only works when the vehicle is in PARK (P) or NEUTRAL (N), when the key is in the ignition and the VALET lockout button is in OFF. 5-7