Chevrolet 2007 TrailBlazer Owner's Manua page 392

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 495.
When replacing the fuel cap, turn it clockwise until
it clicks. Make sure the cap is fully installed.
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 212.
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There may also be a light that comes on in the
instrument panel to let you know if your gas cap
is not properly installed. See Check Gas Cap Light
on page 219 for more information.
CAUTION:
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If a fire starts while you are refueling, do
not remove the nozzle. Shut off the flow
of fuel by shutting off the pump or by
notifying the station attendant. Leave the
area immediately.
Notice: If you need a new fuel cap, be sure to
get the right type. Your dealer/retailer can
get one for you. If you get the wrong type,
it may not fit properly. This may cause
your malfunction indicator lamp to light and
may damage your fuel tank and emissions
system. See Malfunction Indicator Lamp
on page 212.