The filter, as the name suggests, is used to filter out some impurities. Cars usually have four kinds of air, oil, fuel and air conditioning filters, collectively referred to as "four filters". They are responsible for the engine intake system, lubrication system, combustion system cooling system intermediate filtration. In this paper, the gasoline filter and air filter will be analyzed in detail.

Filter function:
1. The role of gasoline filter
Gasoline filter is referred to as steam filter, its main function is to filter impurities in gasoline. If the gasoline filter is too dirty or blocked, the main performance is: when the fuel door, the power is slow, or can not get up, the car is difficult to start, and sometimes it is necessary to spark 2-5 times to hit.

2. The role of the air filter
Air filter can also be referred to as air filter, its main role is to purify the air entering the engine. It is generally composed of a shell and a filter element, and the filter element is arranged in the shell.

If the air filter is dirty, the intake resistance will increase, and when it increases to a certain extent, the engine may not get enough air supply, resulting in a lack of power and so on. If the air filter is broken, dust and sand in the air will enter the engine, which will accelerate the wear and tear of the engine, thereby reducing the service life of the engine.

True and false filtration identification method?
Gasoline filter:
Identify the true and false gasoline filter, a hand weigh, fake and genuine weight is not the same. Because the filter material inside the fake steam filter is different from the real steam filter. Second, look at the appearance, the sealing edge of the fake steam filter, the union is very rough, and you can see it with the naked eye. The sealing edge of the real steam filter is very thin, and the material and luster are different.

Air filter:
The identification method of air filtration is also by looking, the first is to look at the size of the filter element, when buying a new filter element, it needs to be compared with the filter element removed from the original car. The second is to look at the material of the air filter, under normal circumstances, the color of the filter paper of the genuine air filter is unified, and the color of the inferior filter paper is not unified.

Filter maintenance method?
Gasoline filter maintenance:
Because most engines are equipped with disposable non-removable paper filter gasoline filters, it is recommended that the maintenance of gasoline filters be replaced regularly and in time. The replacement cycle is generally 10,000 kilometers, of course, if you add less gasoline impurities, 15000-20000 kilometers to replace one is not a problem. It should be noted that the filter installation must check the oil inlet and outlet arrow mark on the filter, and do not install the reverse.

Air filter maintenance:
Air filter maintenance can be divided into cleaning and replacement. Normally, the air filter must be cleaned and maintained after the car travels 7500-8000km. Of course, in areas with a large degree of sand and dust, the maintenance interval should be shortened accordingly.