1998 GMC Safari Owner's Manual - Page 268

The he1 cap is behind a hinged door on the driver's side of your vehicle. If you get gasoline on yourself and then something ignites it, could be badly you burned. Gasoline can spray out on you if you open the fuel fillercap too quickly. This spray can happen if your tank is nearly full, and is more likely in hot weather. Openthe fuel filler cap slowly and wait for any "hiss" noise stop. Then unscrew to the cap all theway. .. . Be careful not to spill gasoline. Clean gasoline from painted surfaces as soon as possible. See "Cleaning the Outside of Your Vehicle"in the Index. While refueling, place the in the holder onthe fuel cap filler door. When you putthe cap back on, turn it to the right (clockwise) until you hear a clicking sound. Make sure you fully install the cap. diagnostic system can The determine if the fuel cap has been left off improperly or installed. This would allow fuel to evaporate the into atmosphere. See "Malfunction Indicator Lamp" in the Index. To remove the cap, turn it slowly to theleft (counterclockwise). The cap has a spring in it; if you let go of the cap too soon,it will spring back the right. to 6-6