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Fuel Filters
Figure 1-21 .Fuel  filter  elements.

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure  1-19.—Fuel  filter  operation. The  fuel  filter  operates  by  passing  fuel  through  a porous  material  that  blocks  particles  large  enough  to cause a problem in the system. Some filters also act as sediment  bowls;  water  and  larger  particles  of  foreign matter settle to the bottom where they can be drained off (fig.  1-19). Figure 1-20 shows the three types of fuel filters in common use. They are the replaceable in-line filter (view A), the in-line filter element (view B), and the glass  bowl  (view  C). Filter elements are made from ceramic, treated paper, sintered bronze, or metal screen, as shown in figure 1-21. A filter element that differs from the others is a series of closely spaced laminated disks. As the gasoline proses between the disks, foreign matter is blocked out. Diesel  Fuel  Filters Diesel  fuel  filters  are  called  full-flow  filters, because all the fuel must pass through them before reaching the injection pumps. They are very important because diesel fuels are more viscous than gasoline and Figure  1-20.—Fuel  filter  configurations. 1-16







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