Very Cold Weather Operation - Chevrolet T-Series Owner's Manual

It is important that diesel-powered trucks are
refueled only with ultra low-sulfur fuel. The
emission control system requires the use of diesel
fuel with ultra low-sulfur (0.0015% by weight, or
15 ppm, maximum) content. Both ultra low-sulfur
and higher sulfur diesel fuels are available in
the United States. Use of fuels with higher-sulfur
content will affect the function of the emission
components and may cause reduced performance,
excessive smoke, and unpleasant odor.
At a minimum, the diesel fuel you use should
meet the latest version of specification
CAN/CGSB-3.517 (Low Sulfur Diesel) in Canada.
In addition, the Engine Manufacturers Association
(EMA) has identified properties of an improved
diesel fuel for better engine performance and
durability (FQP-1A). Diesel fuels corresponding to
the EMA description could provide better
starting, less noise, and better vehicle
performance. If there are questions about the fuel
you are using, contact your fuel supplier.
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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.