1998 Pontiac Sunfire Owner's Manual - Page 251

When youput the cap back on, turn it to the right (clockwise) until you hear a clicking sound. Make sure you fully install the cap. The diagnostic system can determine if the fuelcap has been left off or improperly installed. This would allow fuel to evaporate into the atmosphere. See "Malfunction Indicator Lamp" in the Index. Filling a Portable Fuel Container A CAUTION: NOTICE: If you need a new cap, be to get the right sure type. Yourdealer 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 fueltank andemissions system may be damaged. See "MalfunctionIndicator Lamp" in the Index. Never fill a portable fuel container while it is in your vehicle. Static electricity discharge from the container can ignite the gasoline vapor.You can be badly burned and your vehicle damagedif this occurs. To help avoid injury to you and others: Dispense gasoline onlyinto approved containers. Do not fill acontainer while it is inside a vehicle, in a vehicle's trunk, pickup bed or on any surface other than the ground. Bring the fill nozzlein contact with the inside of the fill opening before operating the nozzle. Contact should be maintained until the filling is complete. Don't smoke while pumping gasoline. 6-7