1995 Buick Roadmaster Owner's Manual - Page 222

The wagon gas cap behind a hinged door the is on driver's sideof your vehicle. To take off the cap,turn it slowly to the left (counterclockwise). Be careful not to spill gasoline. Clean gasoline from painted surfacesas soon as possible. "Cleaning the See Outside of Your Buick"in the Index. When you put the cap back on, turn the right until it to you hear at least three clicks. NOTICE: If you need a new cap, sure to get the right be If you get type. Your dealer can get one for you. the wrong type, it may not or have proper fit venting, and your fuel tank and emissions system might be damaged.