Fuel filters for modern diesel engines have become increasingly finer due to the development of common rail injection systems. The fuel pressure in common rail engines has steadily increased in recent years as the injection nozzles have become ever smaller to achieve more effective atomization of the fuel.
This has made it necessary to install an additional pre-filter before the actual fuel filter. The pre-filter stops a large proportion of the coarse dirt from reaching the fine fuel filter, significantly extending its service life. In addition, the pre-filter is also responsible for water separation.
After the injection nozzle, the fuel is depressurized, and its flow rate is significantly reduced to achieve atomization of the fuel. Water in the fuel would damage the nozzles due to cavitation as the pressure and velocity are reduced. Therefore, water separation is an important task of the fuel pre-filter. Some fuel pre-filters optionally include a hand pump, a heater, and even water sensors.
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