What system do modern automotive engines use to control fuel injection?

The correct answer is that modern automotive engines primarily use electronic fuel injection (EFI) to control fuel delivery to the engine. This system utilizes sensors and electronic control units (ECUs) to precisely manage the amount of fuel injected into the combustion chamber.

EFI enhances engine performance, efficiency, and emissions control by adjusting the fuel-air mixture based on real-time data such as engine load, temperature, speed, and throttle position. Unlike mechanical systems, which rely on physical components to regulate fuel flow, electronic systems can respond quickly to changing conditions, leading to improved ignition timing and overall engine management.

Modern engines benefit from features such as better fuel atomization, enhanced throttle response, and the ability to achieve optimal fuel economy while reducing harmful emissions. This level of precision and flexibility in managing fuel injection is critical for meeting regulatory standards and improving vehicle performance.

Other fuel delivery methods, like mechanical fuel injection or carbureted systems, do not offer the same level of control and adaptability, making them less common in today's vehicles. Direct fuel injection is a technology that operates within the EFI framework, allowing fuel to be injected directly into the combustion chamber but it is still fundamentally an electronic system.