What principle does an EFI system primarily operate under?

An EFI (Electronic Fuel Injection) system primarily operates under the principle of electronic control. This means that the fuel delivery to the engine is managed by an electronic control unit (ECU), which receives input from various sensors within the engine. These sensors monitor critical parameters such as air intake temperature, throttle position, and engine load. Based on this data, the ECU calculates the optimal amount of fuel needed for efficient combustion and adjusts the fuel injectors accordingly.

This electronic approach allows for precise control of the air-fuel mixture, leading to improved efficiency, reduced emissions, and enhanced performance compared to traditional fuel delivery systems like carburetors. By utilizing electronic control, EFI systems can respond quickly to changes in engine demands and optimize the fuel mix for different operating conditions, ensuring better engine performance and reliability.