Cadillac 2008 CTS - Manual (Page 292)

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 3-40.
The Tighten Gas Cap message in the Driver Information
Center (DIC) will be displayed if the fuel cap is not
properly installed. See DIC Warnings and Messages
on page 3-54 for more information.
{ CAUTION:
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 3-40.
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