2003 GMC Sierra 1500 Pickup Owner's Manual - Page 383

If you get fuel on yourself and tnen something ignites it, you couldbe badly burned. Fuel can spray out on you if you open the fuel cap too quickly. This spray can happen if your is tank nearly full, and more likely in hot is weather. Open the fuel cap slowly and wait for any "hiss" noise to stop. Then unscrew the cap all the way. Be careful not to spill gasoline. Clean gasoline from painted surfaces as soon as possible. See Cleaning the Outside of Your Vehicle on page 5- 105. When you put the fuel 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 fuel cap has been left off or improperly installed. This would allow fuel to evaporate into the atmosphere. See Malfunction Indicator Lamp on page 3-44. Notice: If you need a new fuel be sure to get the cap, right type. Your dealer can get one forIf you get you. the wrong type, may not fit properly. This may it cause your malfunction indicator lamp to light and may damage your fuel tank and emissions system. See "Malfunction Indicator Lamp" the Index. in 5-8 While refueling, hang the fuel cap by the tether using the hook located on the inside of the filler door. To remove the fuel cap, turn it slowly to the left (counterclockwise).