Chevrolet 1994 Lumina Owner's Manual page 163

Filling Your Tank
The cap is behind a hinged door on the
left side of your vehicle.
To take off the cap, turn it slowly to the
left (counterclockwise).
I .
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While refueling, hang the cap inside the
fuel door.
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.
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.