Its function is to filter out harmful particles and water in the engine fuel gas system to protect the oil pump nozzle, cylinder liner, piston ring, etc., reduce wear and avoid blockage. Filter out the iron oxide contained in the fuel.

Even though the diesel is cleaned by sedimentation and filtration before being added to the diesel engine fuel tank, in the refueling process, due to factors such as refueling tools, refueling environment, and unclean fuel tank ports, the diesel will still be polluted. The impurities deposited in the fuel system and the suspended particles in the air will also pollute the diesel. Therefore, the diesel filter on the car is essential, not to mention that the diesel is not really clean before being added to the fuel tank.

Types

There are three types of fuel filters: diesel filters, gasoline filters and natural gas filters.

In order to achieve higher separation efficiency, the first stage is an oil-water separator and the first stage is a diesel fine filter. Abrasion and seizure can even worsen the combustion process of diesel. The water removal method of the diesel filter system is mainly precipitation in the mechanical fuel system. In the era of national third and above emissions, diesel engines mostly use high-pressure common rail fuel systems, and water removal methods mostly use filter paper. Such as Bosch (BOSCH), Mann-Hummel (Mann-Hummel), Parker (Parker), domestic brands such as DIFITE (DIFITE).

Gasoline filters are divided into carburetor type and electronic injection type. For gasoline engines using carburetor, the gasoline filter is located on the inlet side of the fuel transfer pump and has a low working pressure. Generally, nylon shells are used. The gasoline filter is located on the outlet side of the fuel transfer pump and has a high working pressure, usually a metal casing. The filter element of the gasoline filter mostly uses filter paper, but also uses nylon cloth and polymer materials.

Working Principle

The fuel filter is connected in series on the pipeline between the fuel pump and the throttle body inlet. The function of the fuel filter is to filter the iron oxide contained in the fuel. The structure of the fuel filter is composed of an aluminum shell and a bracket with a stainless steel inside. The bracket is composed of high-efficiency filter paper, and the filter paper is in the shape of a chrysanthemum. , To increase the circulation area. The EFI filter cannot be used in common with the carburetor filter. Because the EFI filter often bears the fuel pressure of 200-300KPA, the pressure strength of the filter is generally required to reach 500KPA or more, and the carburetor filter does not need to reach such a high pressure.

Generally, there are various impurities in gasoline, and long-term use of the fuel tank will deposit certain dirt. The above reasons will affect the quality of gasoline. The function of the gasoline grid is to filter the above-mentioned impurities. The gasoline in the fuel tank is filtered by the gasoline grid to reach the combustion chamber of the engine, and its clean purity can be effectively guaranteed.

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