2003 GMC Safari Owner's Manual - Page 226

If you get fuel on yourself and then something ignites it, you could be badly burned. Fuel can spray out on you if you open the fuel cap too quickly. This spray can happen if your tank is nearly full, and is more likely in hot 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 fuel. Clean fuel from painted surfaces as soon as possible. See Cleaning the Outside of Your Vehicle on page 5-86. When filling the tank do not overfill by squeezing in much more fuel after the pump shuts off. While refueling, let the fuel cap hang by the tether below the fuel fill opening. To remove the fuel cap, turn it slowly to the left (counterclockwise).The fuel cap has a spring in it; if you let go of the cap too soon, it will spring back to the right. 5-9