Pontiac 2004 Montana Owner's Manual page 350

While refueling, let the fuel cap hang by the tether as
shown.
5-8
CAUTION:
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If you spill fuel and then something ignites it,
you could be badly burned. Fuel can spray out
on you if you open the fuel cap too quickly. This
spray can happen if your tank is nearly full, and
is more likely in hot weather. Open the fuel cap
slowly and wait for any "hiss" noise to stop.
Then unscrew the cap all the way.
Don't top off or overfill your tank, and wait a few
seconds after you've finished pumping before you
remove the nozzle. Be careful not to spill fuel. Clean
fuel from painted surfaces as soon as possible.
See Cleaning the Outside of Your Vehicle on
page 5-101.
When you put the fuel cap back on, turn it to the right
(clockwise) until you hear a clicking sound. Make
sure you fully install the cap. The diagnostic system can
determine if the fuel cap has been left off or improperly
installed. This would allow fuel to evaporate into the
atmosphere. See Malfunction Indicator Lamp on
page 3-44.