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The fuel filter can be devided into three types: diesel filters, gasoline filters and natural gas filters. Its function is to remove the solid debris contained in the fuel, prevent the fuel system from clogging (especially the fuel injection nozzle), reduce mechanical wear, and ensure the stable operation of the engine. In addition, the fuel filter also has the function of filtering moisture to reduce the moisture in the fuel from entering the engine and causing fatal damage to the engine.
There are two models of the fuel filter: one is an external type, which is generally located in the lower part of the chassis; the other is a built-in type, which is located in the fuel tank. The two are just different in the installation position, and the effect is still the same. In addition, the external type is divided into two types: ordinary straight-in direct type and with oil return line. For different vehicles, the fuel filter replacement cycle is different. You need to consult the vehicle maintenance manual for details. If the fuel quality is not good, the replacement cycle can be shortened.
The function of the fuel filter is to filter impurities in the fuel, but after a long period of use, the inside of the fuel filter may be blocked by impurities and affect the fuel supply, resulting in a reduction in fuel supply and difficulty in starting the engine. In addition, long-term blockage of the fuel filter will cause premature damage to the gasoline pump, so the fuel filter should be replaced. Inferior fuel filters are made of poor materials and poor filtering effects. Long-term use of the internal filter element may cause blockage of the oil circuit, resulting in insufficient fuel pressure and the vehicle cannot be started. At the same time, it will cause abnormal fuel system pressure, which directly leads to insufficient engine power or insufficient combustion, and damages valuable components such as the three-way catalyst and oxygen sensor.
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