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What are the components of an electronic fuel injection system?

2 Answers

AliviaDella

07/29/25 6:02am

Electronic fuel injection systems consist of the following three subsystems: the fuel supply system, the intake system, and the electronic control system. 1. Fuel Supply System: The fuel supply system is composed of the fuel tank, fuel pump, fuel filter, pressure regulator, pulsation damper, fuel injectors, as well as fuel supply lines and return lines. 2. Intake System: The intake system includes the air filter, throttle valve, air flow meter, intake chamber, idle control valve, and intake control valve. The function of the fuel supply system and intake system is to mix the fuel injection quantity and intake air volume determined by the ECM/ECU based on the throttle position (engine load) and engine speed into a combustible mixture, which enters the cylinders for combustion and power generation. 3. Electronic Control System: The electronic control system consists of several sensors that detect various engine conditions, an ECU that determines the fuel injection quantity based on sensor signals, and fuel injectors that operate according to ECU commands. Its main function is to determine the optimal fuel injection timing and duration based on different engine operating conditions.

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LeMarley

08/12/25 9:32am

I remember when working with cars, the electronic fuel injection system was quite complex, mainly consisting of several core components. First is the electronic control unit (ECU), which processes all signals and determines the fuel injection amount. Next is the sensor family: the air flow sensor monitors intake air volume, the throttle position sensor checks throttle opening, and the oxygen sensor detects exhaust composition to adjust the air-fuel mixture ratio. The actuators include the fuel injector, which actually sprays the fuel, and the fuel pump, ensuring sufficient fuel pressure supply. Other components like the fuel filter, fuel lines, and fuel tank connect the system to keep the process smooth. The entire system works together to precisely control fuel injection, improving efficiency and reducing emissions. Common issues, such as dirty sensors causing engine shaking, can be prevented with regular cleaning. When repairing, starting with simple checks first can save money.

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