Black plate (28,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - CRC - 6/5/14
9-28
Driving and Operating
It is recommended to use Ultra Low
Sulfur No. 1-D diesel fuel or a blend
of No. 1-D and No. 2-D diesel fuel to
enhance vehicle operation in cold
weather at temperatures below (0°C
(32F). Use of No. 1-D diesel fuel
may lower the fuel economy.
Water in Fuel
Improper fuel tank inspection or
cleaning, or contaminated fuel from
suppliers, can cause water to be
pumped into the fuel tank along with
the diesel fuel. If a WATER IN FUEL
message displays, the water must
be drained immediately.
{
Warning
Diesel fuel containing water is still
combustible. You or others could
be burned. If the fuel needs to be
drained, keep sparks, flames, and
smoking materials away from the
mixture.
{
Caution
Water in the diesel fuel can
corrode internal components of
the fuel system and lead to
severe damage. It can also
support fungus or bacteria
growth, which can damage the
fuel system and fuel operated
heater (FOH) (if equipped). Even
with a diesel fuel biocide, the fuel
system may still need to be
cleaned. Your dealer can advise
of the appropriate solution.
If the fuel tank needs to be
purged to remove water, see your
dealer or a qualified technician.
Improper purging can damage the
fuel system and block the FOH.
Water in Fuel Troubleshooting
If the WATER IN FUEL SERVICE
REQUIRED message comes on:
Problem
Recommended
Action
Message
displays but
goes off during
the ignition
cycle.
The fuel filter is
approximately
half full of water.
Drain the water
immediately.
See "Removing
Water from Fuel
Filter" later in
this section.
