Cold Weather Operation; Water In Fuel - GMC Duramax Diesel 2015 Owner's Manual

9-28 Driving and Operating
Accidental Refueling with
Gasoline
Caution
If the vehicle is accidentally
refueled with gasoline, do not
continue driving the vehicle
except to get to a location where
it can be stopped safely. Driving
the vehicle will damage the fuel
system. Have the vehicle towed
to a qualified technician to have
the gasoline removed from the
tank, preferably until the fuel
gauge reads near E (Empty).
Refuel with Ultra Low Sulfur
Diesel fuel.
What Fuel to Use in Mexico
Use diesel fuel specification
NOM-086 Pemex UBA, which meets
the Ultra Low Sulfur Diesel fuel
requirement of 15 ppm sulfur
maximum. This fuel is not available
in all regions of Mexico.
Caution
Use of diesel fuel other than Ultra
Low Sulfur Diesel (15 ppm sulfur
maximum) will damage the
exhaust after-treatment system.
This damage would not be
covered by the vehicle warranty.

Cold Weather Operation

In cold weather, the fuel filter may
become clogged by wax naturally
present in the fuel. To unclog it,
move the vehicle to a warm garage
area and allow the filter to warm up.
The fuel filter may need to be
replaced. See Fuel Filter
Replacement on page 9-34.
At temperatures below 0 °C (32 °F),
it is recommended to avoid using
biodiesel blends above (5% blend)
which may cause fuel filter plugging,
system gelling, and freezing that
may affect vehicle starting.
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 (32 °F). 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.