Very Cold Weather Operation; Water In Fuel - GMC T-Series 2007 Owner's Manual

Very Cold Weather Operation

Follow the instructions listed previously under the
heading "What Fuel to Use."
Notice: Never use home heating oil or
gasoline in your diesel engine. They can
cause engine damage.
In cold weather, your fuel filter may become
clogged (waxed). To unclog it, move the vehicle
to a warm garage area and warm the filter to
between 32°F and 50°F (0°C to 10°C). You will
not need to replace it. Additional information on
the fuel filter follows.

Water in Fuel

CAUTION:
{
Diesel fuel containing water is still
flammable. You could be burned. If you
ever try to drain water from your fuel,
keep sparks, flames and smoking
materials away from the mixture.
198
Notice: If there is water in your diesel fuel
and the weather is warm or humid, fungus
and bacteria can grow in the fuel. They
can damage your fuel system. A diesel fuel
biocide can be used to sterilize your fuel
system. However, your fuel system may still
need to be cleaned. Your dealer/retailer
can advise you of the appropriate solution.
If your fuel tank needs to be purged to remove
water, see your dealer/retailer or a qualified
technician. Improper purging can damage your
fuel system.
Sometimes, water can be pumped into your fuel
tank along with your diesel fuel. This can happen if
a service station does not regularly inspect and
clean its fuel tanks, or if it gets contaminated fuel
from its suppliers.
Your dealer/retailer can show you how to do this.
If this happens, a
water-in-fuel indicator
light will come on in the
instrument panel. If it
does, the water must
be drained.