The role of the fuel filter is filter out the harmful impurities and water in fuel system to protect the normal work, reduce wear and avoid jams, improve engine life. The oil filter usually used fuel filter paper, also used nylon and fabric polymer materials. And the diesel filter usually used filter paper, also use felt or polymer materials. The structure of diesel filter are with roughly the same of oil filter which has the change type and spin type. Now I give you a suggestion of china filters supplier. http://www.waxfilter.com/