PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 2/TASK 2
as main filters for protecting the fuel injection pump. Many of the filters
in use are similar to lubricating oil filters. The bagtype filter also is
used. The filtering medium is a large bag of close, evenly woven, lintless,
acidresisting textile material. Maximum benefit is derived from the bag's
large area by keeping the sides of the bag separated by a wirescreen mat.
The screen is the same size as the bag, and the two are fastened detachably
to a central feeding spool and wound around it. Layers of bag and screen
thus are alternated through the winding, and the entire surface of the bag
is available for filtering purposes. The fuel to be filtered flows from the
filter inlet at the top, through the spool, and out of the ports to the
inside of the bag. The dirt, solids, abrasives, and carbon are caught in
the bag, and the clean fuel passes outward and to the filter outlet. The
bag may be removed, cleaned, and reinstalled.
FIGURE 65. SECONDARY FUEL FILTER.
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