Chevrolet 1995 Lumina Owner's Manual page 204

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