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Fuel filter with diesel oil filter, fuel filter and gas filter. Its purpose is to filter out harmful particles in the engine fuel gas system and moisture, in order to protect the pump nozzle, cylinder liner, piston ring, etc., to reduce wear and avoid congestion. Diesel filter structure is roughly the same as the oil filter, a removable and spin pack type two kinds, but its work under pressure and oil temperature resistant requirements from the oil filter is much lower, and the requirement of the filtration efficiency is much higher than the oil filter. Diesel filter filter using filter paper, and a felt or polymer materials. Diesel filter in addition to the mechanical impurity in the filter diesel, is another important function of the filter. The presence of water great harm for the diesel engine fuel supply system, corrosion, wear and tear, stuck even worsen diesel combustion process. In addition to the main water way of diesel oil filtration system is precipitation. Or one settling chamber is set at the bottom of the filter, or use special precipitator. Whether a deposit at the bottom of the filter cavity, or special precipitator have water drain valve, when the water accumulation to a certain amount to open the drain valve.
 
Has carburetor and efi gasoline filter, using the carburetor petrol engine, fuel filter in the oil transfer pump inlet side, working pressure is small, generally adopts nylon case, efi engine fuel filter is located on the export side of the oil transfer pump, the working pressure is higher, often use a metal shell. The fuel filter filter using filter paper, and a use of nylon fabric, high polymer material.