128 Maintenance
Replacing Fuel Filters
General
The filters are an important part of the fuel
system. Always replace the filters at the
recommended intervals and use the recom-
mended filter types for the best engine
operation and service life.
A primary fuel filter is located on the outer,
right or left frame rail behind the cab. This
filter consists of a filter cartridge, a water
separation bowl and may have a fuel heater
built in.
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The secondary fuel filter is located on the
left side, under the control unit on D12 and
on the left, front side on the D7 engine. The
filter is contained in a disposable cartridge.
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Fuel Filter Change Intervals
Filter change intervals should be tied to the
oil change intervals. Depending on the oil
change intervals and/or the fuel cleanliness,
the filters can be changed every or every
other oil change.
Maximum mileage between fuel filter
change is 25,000 miles (40,000 km) or 600
hours.
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