1996 GMC Suburban Owner's Manual - Page 260

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. When you put the cap back on, turn it to the right until you hear at least three clicks. 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" i n the Index. Checking Things Underthe Hood If your vehicle has air conditioning, the auxiliary engine fan under the hood can start up and injure you even when the engineis not running. Keep hands, clothing and tools away from any underhood electric fan. NOTICE: If you need a new cap, be sure to get the right for type. Your dealer can get one you. If you get the wrong type, it may not fit have proper or venting, and your fuel tank and emissions system might be damaged. Things that burn can get on hot engine parts and start a fire. These include liquidslike gasoline or diesel fuel, oil, coolant, brake fluid, windshield washer and other fluids, and plastic or rubber. You or others could be burned. Be careful not to drop or spill things that will burn onto ahot engine. 6-6