1-11. SYSTEM TECHNICAL PRINCIPLES OF OPERATION.
Figure 1-4. 2000 GPM Filter-Separator Principles of Operation
Second Stage Filter. The second stage filter function is to further block the flow of water in the outlet fuel
stream. Five permanent separator filter elements in parallel form this stage. These cylindrical filter elements are
made of a fine screen material coated with TFE, a plastic that repels water. Fuel flows from the outside of the
elements through their screen wall, to the inside. From there, fuel flows to the filter-separator outlet. Water
blocked by the elements falls to the tank bottom and collects in the water sump.