Referred to the fuel filter, I believe many owners are relatively unfamiliar. Although its popularity is not high, but the role can not be ignored. It can clear the engine fuel system of the total harmful substances, reduce engine wear and plug. In the spirit of universal knowledge of the car, in today's article, pickup China small series for you to introduce the relevant knowledge of the fuel filter, the owners look carefully.
Fuel filter working principle
The fuel filter is connected in series between the fuel pump and the throttle valve body inlet. The function of the fuel filter is to remove the solid impurities such as iron oxide, dust, etc. in the fuel oil, to prevent the fuel system from clogging (especially the fuel injection nozzle). Reduce mechanical wear, ensure the stable operation of the engine and improve the reliability. The structure of the fuel oil device is composed of an aluminum shell and a stainless steel bracket, and the bracket is provided with an efficient filter paper piece, and the filter paper piece is formed into a chrysanthemum shape to increase the circulation area. Filter and oil filter EFI not universal.
Because EFI filter often bear the 200 - 300kPa fuel pressure, so the compressive strength of the filter general requirements above 500KPA and the oil filter is not necessary to reach such a high pressure.
Fuel filter classification
1, diesel filter
The structure of the diesel oil filter is roughly the same as that of the oil filter, there are two kinds of replaceable and rotary. But the bear working pressure and oil temperature resistant requirements higher than the oil filter is much lower, and its filtering efficiency is much higher than the oil filter. The filter of diesel filter with filter paper, have used blankets or polymer materials.
Diesel filter can be divided into two kinds:
(1) the original address of the diesel water separator: http://www.pikacn.com/news/20155/2674.html
The important function of diesel water separator is to separate the water from diesel oil. The existence of water for the diesel engine fuel supply system is great harm, corrosion, wear and tear, and even worsen the combustion process of diesel oil. China more than three of the emissions of the engine for water separation put forward higher requirements, high requirements on the need to use high performance filter media.
(2) diesel fine filter
Diesel fine filter is used to filter small particles in diesel, the country more than three emissions of diesel engine is mainly aimed at 5 - 3 micron particle filter efficiency.
2, gasoline filter
Carburetor EFI fuel filter and fuel filter, carburetor gasoline engine, gasoline filter is located in the pump inlet side, small pressure. In general, the nylon shell, EFI engine the fuel filter is located in the outlet side of the pump, high working pressure, usually by metal shell. The filter element of the gasoline filter adopts filter paper, and also has the use of nylon cloth and polymer material.
Gasoline filter due to the combustion of gasoline engines and diesel engines are different, the overall requirements of the fuel filter is not harsh, so the price is cheap.
3, natural gas filter
Natural gas filter is widely used in metallurgy, chemical industry, petroleum, paper making, medicine, food, mining, power, city, family and other fields. Gas filter is conveying medium piping is indispensable in a device, usually installed in the valve, relief pressure valve, a valve positioning or other equipment imports end, used to remove impurities in the media, to protect the valves and equipment in normal use, reduce equipment maintenance costs.
燃油濾清器的作用，是把含在燃油中的 氧化鐵、粉塵等固體雜物除去，防止燃油系統堵塞（特別是 噴油嘴）。減少機械磨損，確保發動機穩定運行，提高可靠性。
The function of the fuel filter is to remove the solid impurities such as iron oxide, dust, etc. in the fuel oil, to prevent the fuel system from clogging (especially the fuel injection nozzle). Reduce mechanical wear, ensure the stable operation of the engine and improve the reliability.
Why to replace the fuel filter
As is known to all, gasoline is made from crude oil through a complex process, and then transported to the various gas stations through the specialized channels, and ultimately to the owner of the fuel tank. In this process, impurities in gasoline is inevitable to enter the fuel tank, in addition, with the extension of the use of time, impurities will increase. For filter fuel filter will become dirty, attached with dross, and so on, filtering effect will be greatly reduced.
It is proposed to replace a few kilometers, if not change, or delay change, will certainly affect the vehicle performance, resulting in circuit poor, vehicle refueling boring phenomenon, finally lead to chronic damage the engine and engine overhaul.
How long is the fuel filter changed
Car fuel filter replacement cycle is generally about 10000 km, the specific optimal timing of the vehicle can refer to the use of the vehicle manual. Usually, the fuel filter replacement is in the car maintenance, and air filter and oil filter replacement at the same time, this is our daily said "filter".
Regular replacement of filters are the key ways for maintenance of the engine, to reduce engine wear, to ensure the service life has a very important significance.
How to replace the fuel filter
As the saying goes, do it yourself, have ample food and clothing. The next small series will introduce how to change their own fuel filter, but also allows you to more intuitive understanding of the structure of the fuel filter.
1, disconnect the power supply of vehicles
Pull out the key of the vehicle, and disconnect the fuel pump fuse or disconnect the vehicle power supply, avoid the oil pump when the pump is removed.
2, take out the pump assembly
The rear seat cushion and the cover plate of the oil pump are removed, and the oil pump assembly can be seen at the time. Oil pump assembly is a black card ring fixed, removal of oil pump on line in and the tubing using special tools can remove this card ring. After removing the clamping ring, the oil pump can be taken out