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Racor fuel filters have been the standard in the marine industry for a long time and you can get filters anywhere. Racor Marine Fuel Filter/Water Separator - Diesel Fuel How it works: As fuel enters, it moves past the internal check valve then through the turbine centrifuge where it flows in a spiraling direction, spinning off large articulates and water droplets. Being heavier than fuel, they fall to the bottom of the collection bowl. Smaller water droplets bead-up along and on the sides of the internal components and on the surface of the Aquabloc II element. When heavy enough, they too fall into the high-capacity bowl to be drained as needed. Besides repelling water and tiny solids, asphaltenes, algae and rust are filtered from fuel by the Aquabloc II element. Because Aquabloc II elements are waterproof, they remain effective longer.
Besides removing asphaltenes, gums and varnishes, Aquabloc II elements filter tiny particles of dirt and algae from fuel. Aquabloc II elements are rustproof – with polymer end-caps that won’t ever corrode.
Regarding the FASS Fuel Air Separation System, if you have air in your fuel, you probably have a cracked fuel line and should fix it. Unless their system removes smoke & mirrors also.