The engine fuel filter is a two-stage pleated paper type filter (Figure 4-20). The first stage consists of approximately 350 sq. inches of filtering area and will remove 96% of particles 5-6 microns and larger. The second stage is made of the same paper material with glass particles and consists of approximately 100 sq. inches of filtering surface.
The second stage is 98% effective in filtering the fuel already filtered by the first stage. Particles which are larger than 10 microns may damage pump’s internal components. The rectangular design of this filter allows the use of these 2 different elements.
Figure 4-17 compares various micron sizes and will ultimately show the effectiveness of the filter.
