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Engine fuel injection refers to the process of atomizing fuel and UEFA live freespraying it into the cylinder at a certain pressure, mixing air and ignition combustion, so as to drive the engine to run. The working principle and maintenance method of the engine fuel injection system are the knowledge that we must understand and master when maintaining and repairing cars.I. Working principle of engine fuel injection system The engine fuel injection system is composed of fuel supply, fuel injection mechanism, fuel filter, etc. Its main working principles are as follows: 1. Fuel supply: The fuel is extracted from the fuel tank through the fuel pump, filtered by the filter, and then transported to the fuel injection mechanism at a certain pressure. Two. Fuel injection mechanism: The fuel injection mechanism atomizes the fuel into tiny fuel particles, sprays it into the mixing chamber, mixes it with the mixed air and burns it. 3. Fuel filter: The fuel filter can filter out the impurities in the oil, ensure the purity of the fuel, and avoid blockage of the fuel injection mechanism. Four. Control unit: The control unit will control the amount of fuel injection according to the information obtained from various sensors, so as to ensure the normal operation of the engine. II. Maintenance method of engine fuel injection system 1. Fuel filter replacement: The filtration effect of the fuel filter will gradually decrease with the increase of use time, so it needs to be replaced regularly.When replacing, you need to turn off the power supply of the fuel pump first, then remove the original fuel filter, install the new fuel filter and connect the oil pipe. Two. Fuel injector replacement: The blockage or failure of the fuel injector will cause problems such as difficult starting the car, poor acceleration and high fuel consumption. When replacing the fuel injector, it is necessary to first determine whether it is the problem of the fuel injector, then remove the original fuel injector and install a new fuel injector according to the specifications. 3. Fuel pump replacement: Fuel pump is an important part of driving fuel transportation. If the fuel pump fails, it will cause problems such as the engine cannot start, turn off or accelerate smoothly. To replace the fuel pump, you need to remove the original fuel pump, install a new fuel pump, and connect it to the oil pipe. Four. Cleaning the fuel injector: After a period of use, the fuel injector may be blocked by silt, impurities, etc. The oil injector can be cleaned with detergent. For specific operation, you need to refer to the instructions of the detergent.5. Fuel pump pressure test: When the engine is started, the fuel pump pressure gauge can be used for pressure test to measure whether the pressure output of the fuel pump is normal. If the output pressure of the fuel pump is insufficient, the fuel pump needs to be replaced. In a word, mastering the working principle and maintenance method of the engine fuel injection system can help us better maintain and maintain the car and avoid unnecessary troubles and losses caused by engine failure.

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