Chevrolet 2008 Corvette Owner's Manual page 282

To remove the fuel cap, turn it slowly counterclockwise.
5-10
There is also a manual
fuel door release tab. It is
located against the
upper trim in the rear
compartment on the
driver's side of the vehicle.
Pull the tab to release
the fuel door.
While refueling, let the cap hang by the tether below the
fuel fill opening.
CAUTION:
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Fuel can spray out on you if you open the fuel
cap too quickly. If you spill fuel and then
something ignites it, you could be badly burned.
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.
Be careful not to spill fuel. Do not top off or overfill the
tank and wait a few seconds after you have finished
pumping before removing the nozzle. Clean fuel
from painted surfaces as soon as possible.
See Washing Your Vehicle on page 5-91.