2003 GMC Envoy Owner's Manual - Page 303

I son ou get fuel on yourself and then 'g ignites it, you could be badly burned. Fuel can spray out on you you open the fuel cap too if quickly. This spray can happen your tank is if nearly full, and is more likely in weather. hot 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 5-85. When filling the tank do not overfill by squeezing in much more fuel after the pump shuts off. 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). The fuel cap has a spring in it. If you let go of the cap too soon, it will spring back to the right. 5-8