1996 Pontiac Bonneville Owner's Manual - Page 252

I you get gasoline onyourself and then f something ignites it, you could be badly burned. Gasoline can spray outon you if you open the fuel filler cap too quickly. This spraycan happen if your tankis nearly full, and is more likely in hot weather. Open the fuel filler cap slowly and '(hiss"noise to stop. Then un,screw wait for any the capall the way. Be careful not to spill gasoline. Clean gasoline from painted surfaces as soon as possible. See "Cleaning the Outside of Your Pontiac" in the Index. When you put the cap back turn it to the right until on, you .hear at least three clicks. Make surefully install you the cap. The diagnostic system can determine fuel if the cap has been, left or improperly installed. off This would allow fuel to evaporate into the atmosphere. See "Malfmction Indicator Lamp" in the Index. NOTICE: If you need a new cap, be sure toget the right type. Your dealer canget one for you. If you get the wrong type, it may not fitor have proper venting, and your'fuel tank and emissions system might be damaged. \