Cadillac 1996 DeVille Owner's Manual page 266

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CAUTION:
If you get gasoline on yourself and then
something ignites it, you could be badly burned.
Gasoline can spray out
on
you if you open the
fuel filler cap too quickly. This spray can happen
if your tank is nearly full, and is more likely in
hot weather. Open the fuel filler cap slowly and
wait for
any "hiss" noise to stop. Then unscrew
the cap all the way.
Hang the cap inside the fuel door while refueling.
TO take off the cap, turn it slowly to the left
(counterclockwise).
Be careful not to spill gasoline. Clean gasoline from
painted surfaces as soon as possible. See "Cleaning the
Outside of Your Cadillac" in the Index.
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