1995 Buick Regal Owner's Manual - Page 214

Checking Things Under the Hood Be careful not to spill gasoline. Clean gasoline from painted surfaces as soon as possible. See "Cleaning the Outside of Your Buick" in the Index. When you put the cap back on, turn it to the right until you hear at least three clicks. NOTICE: If you need a new cap, be sure the right to get type. Your dealer can get one for you. If you get the wrong type,it may notfit or have proper venting, and your fuel tank and emissions system might be damaged. L 6-6