SAAK Filter

operational principle

The fuel filter is connected in series to the pipeline between the fuel pump and the throttle valve inlet. The function of a fuel filter is to remove solid impurities such as iron oxide and dust contained in the fuel, preventing blockages in the fuel system (especially the fuel injectors). Reduce mechanical wear, ensure stable engine operation, and improve reliability. The structure of the fuel injector consists of an aluminum shell and a stainless steel bracket, which is equipped with high-efficiency filter paper in a chrysanthemum shape to increase the flow area. The electronic fuel injection filter cannot be used interchangeably with the chemical oil filter. Due to the fact that electronic fuel injection filters often withstand fuel pressure of 200-300KPA, the pressure resistance strength of the filter is generally required to reach 500KPA or above, while chemical oil filters do not need to reach such high pressure.

Classification Introduction

There are three types of fuel filters: diesel filter, gasoline filter, and gas filter. Its function is to filter out harmful particles and moisture in the engine fuel system, to protect the oil pump nozzle, cylinder liner, piston ring, etc., reduce wear, and avoid blockage.

The structure of diesel filters is roughly the same as that of oil filters, with two types: replaceable and rotary. But its working pressure and oil temperature resistance requirements are much lower than those of oil filters, while its filtration efficiency requirements are much higher than those of oil filters. The filter element of diesel filters is mostly made of filter paper, and some also use felt or polymer materials.

Diesel filter 

Diesel filters can also be divided into diesel water separators and diesel fine filters. The important function of the oil-water separator is to separate water from diesel fuel. The presence of water poses great harm to the fuel supply system of diesel engines, as rust, wear, jamming, and even deterioration of the combustion process of diesel can occur. Due to the high sulfur content in Chinese diesel, during combustion, it may even react with water to form sulfuric acid that corrodes engine components. The traditional method of water removal is mainly sedimentation, which is achieved through a funnel structure. National level III and above emission engines require higher requirements for water separation, which requires the use of high-performance filtering media.

The diesel fine filter is used to filter out small particles in diesel, and diesel engines with emissions above Grade III in China mainly focus on the filtration efficiency of 3-5 micron particles.

Gasoline filter

There are two types of gasoline filters: carburetor type and electronic fuel injection type. For gasoline engines that use carburetors, the gasoline filter is located on the inlet side of the fuel pump with low working pressure and generally uses a nylon shell. For electronic fuel injection engines, the gasoline filter is located on the outlet side of the fuel pump with high working pressure and usually uses a metal shell. The filter element of gasoline filters often uses filter paper, as well as nylon cloth and polymer materials.

Due to the different combustion methods of gasoline engines compared to diesel engines, the overall requirements for gasoline filters are not as strict as diesel filters

Main functions

The function of a fuel filter is to remove solid impurities such as iron oxide and dust contained in the fuel, preventing blockages in the fuel system (especially the fuel injectors). Reduce mechanical wear, ensure stable engine operation, and improve reliability.