In a gasoline engine, how does a fuel injector operate?

The operation of a fuel injector in a gasoline engine primarily relies on electronic control to manage fuel flow into the engine's combustion chamber. This electronic control is achieved through an Engine Control Unit (ECU), which sends signals to the injector based on various inputs, such as engine temperature, throttle position, and air intake.

When the signal is received, the fuel injector opens a nozzle that allows fuel to atomize and mix with the incoming air. This precise control is crucial for optimizing combustion efficiency, ensuring proper fuel-to-air ratio, and minimizing emissions. The electronic operation allows for quick and accurate adjustments to the amount of fuel injected, which can significantly affect engine performance and responsiveness under different driving conditions.

In contrast, options that suggest mechanical force only, manual adjustment, or reliance on atmospheric pressure do not account for the advanced technology of modern fuel injection systems which utilize electronic controls for efficiency and performance.