GMC TopKick 2007 Owner's Manual page 261

CAUTION:
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Fuel vapor is highly flammable. It burns
violently, and that can cause very bad
injuries. Do not smoke if you are near
fuel or refueling your vehicle. Keep
sparks, flames and smoking materials
away from fuel.
The fuel cap can be on either or both sides of
your vehicle depending on option content.
To take off the cap, turn it slowly counterclockwise.
CAUTION:
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If you get fuel on yourself 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
CAUTION: (Continued)
CAUTION: (Continued)
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.
When you put the cap back on, turn it clockwise
until it is tight.
Notice: If you need a new fuel cap, be sure to
get the right type. Your dealer 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 172.
If you have dual tanks, fill the driver's side tank, or
forward tank, first. The fuel gage will give better
readings this way. Your gage will show the
total fuel left in both tanks.
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