1999 Buick Riviera Owner's Manual - Page 237

yellowblue Filling Your Tank CAUTION: Gasoline vapor is highly flammable. It burns violently, and that can cause very bad injuries. Don't smoke if you're near gasoline or refueling your vehicle. Keep sparks, flames and smoking materials away from gasoline. The release button is on the driver's door below the inside door handle. The cap is behind a hinged door on the driver's side of your vehicle. 6-5