• Glow plugs (if equipped)
• Engine coolant heaters, which may be an OEM
option
• Fuel heaters, which may be an OEM option
• Fuel line insulation, which may be an OEM option
The cloud point is a temperature that allows wax
crystals to form in the fuel. These crystals can cause
the fuel filters to plug.
The pour point is the temperature when diesel fuel will
thicken. The diesel fuel becomes more resistant to
flow through fuel lines, fuel filters,and fuel pumps.
Be aware of these facts when diesel fuel is
purchased. Consider the average ambient air
temperature for the engine's application. Engines that
are fueled in one climate may not operate well if the
engines are moved to another climate. Problems can
result due to changes in temperature.
Before troubleshooting for low power or for poor
performance in the winter, check the fuel for waxing.
Low temperature fuels may be available for engine
operation at temperatures below 0 °C (32 °F). These
fuels limit the formation of wax in the fuel at low
temperatures.
For more information on cold weather operation, refer
to the Operation and Maintenance Manual, “Cold
Weather Operation and Fuel Related Components in
Cold Weather”.
i05359588
Fuel Related Components in
Cold Weather
Fuel Tanks
Condensation can form in partially filled fuel tanks.
Top off the fuel tanks after you operate the engine.
Fuel tanks should contain some provision for draining
water and sediment from the bottom of the tanks.
Some fuel tanks use supply pipes that allow water
and sediment to settle below the end of the fuel
supply pipe.
Some fuel tanks use supply lines that take fuel
directly from the bottom of the tank. If the engine is
equipped with this system, regular maintenance of
the fuel system filter is important.
Drain the water and sediment from any fuel storage
tank at the following intervals: weekly, service
intervals and refueling of the fuel tank. Draining will
help prevent water and/or sediment from being
pumped from the fuel storage tank and into the
engine fuel tank.
Fuel Filters
After you change the fuel filter, always prime the fuel
system in order to remove air bubbles from the fuel
system. Refer to the Operation and Maintenance
Manual in the Maintenance Section for more
information on priming the fuel system.
The micron rating and the location of a primary fuel
filter is important in cold-weather operation. The In-
line filter, primary fuel filter, and the fuel supply line
are the most common components that are affected
by cold fuel.
Fuel Heaters
Note: The OEM may equip the application with fuel
heaters. If so, the temperature of the fuel must not
exceed 73 °C (163 °F) at the fuel transfer pump. The
fuel heater should be installed before the electric lift
pump.
For more information about fuel heaters (if equipped),
refer to the OEM information.
i04928593
Diesel Exhaust Fluid in Cold
Weather
Due to the freezing point of Diesel Exhaust Fluid
(DEF) the aftertreatment system is equipped with
electrically heated DEF lines. The system also has a
coolant heated element in the DEF tank. For
information on DEF refer to this Operation and
Maintenance Manual, “Fluid Recommendations”.
SEBU8732 71
Cold Weather Operation
Fuel Related Components in Cold Weather
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