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Fuel Filtration

Cold Weather & Fuel Filters
FUEL FILTRATION Fuel Filter Problems in Cold Weather

Encountering poor quality or unconditioned fuel is
inevitable, so some precautions should be made when
operating in cold weather. Depending on the severity of
winter operating conditions, many operators may choose to
protect their equipment through the use of fuel additives,
fuel heaters, and fuel water separators.
Most fuel related winter problems can be avoided
using a #1 diesel or a winterized diesel blend.

Engine Power Loss
Diesel engine power loss during winter operation is a
common occurrence and source of complaint. Unless there
is a component failure within the engine, the problem
can usually be traced back to paraffin crystal formation in
the fuel which restricts flow through fuel filters. Freezing
temperatures can also cause any emulsified water to
form a fuel/ice slush, further restricting filters. Frequently,
fuel filters are blamed for the problem when, in fact, the
problem is caused by the effect of cold weather on summer
grade #2 diesel.

Cloud Point
The Cloud Point is the temperature at which paraffin or wax,
which is naturally present in diesel fuel, begins to form
cloudy wax crystals. When the fuel temperature reaches
the cloud point, these wax crystals flowing with the fuel
coat the filter and quickly reduce the fuel flow, starving the
engine. Typical cloud point temperatures range from: -18°F
(-28°C) to +20°F (-7°C), but may occasionally be as high as
+40°F (4.4°C). #1 diesel fuel (or kerosene) contains very little
paraffin, and therefore has a cloud point near -40°F (-40°C).

Re-printed with permission of the Filters Manufacturer's
Council : Technical Service Bulletin 91-1R3

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