1997 Buick Century Owner's Manual - Page 273

When you put the capback on, turn it to the right (clockwise) untilyou hear a clickingsound. Make sure you fully install the cap. The diagnostic system can determine if the fuel cap been left off or improperly has installed. This would allow fuel to evaporate into the atmosphere. See "Malfunction Indicator Lamp" in the Index. Checking Things Under theHood NOTICE: An electric fan underthe hood can start up and injure you even whenthe engine is not running. Keep hands, clothing and tools awayfrom any underhood electric fan. I If you need a new cap, be sure to get the right type. Your dealer can get onefor you. If you get the wrong type,it may not fit properly. This may cause your malfunction indicator lamp to light and your fuel tank andemissions system may be damaged. See "MalfunctionIndicator Lamp" in the Index. I 1 I Things that burn can on hot engine get parts and start a fire. These include liquids like gasoline, oil, coolant,brake fluid, windshield washerand other fluids, and plastic or rubber. You or others could beburned. Be careful not to drop or spill things that will burn onto a hotengine. 1 6-7