What is the purpose of the fuel injection system in an internal combustion engine?

The fuel injection system's primary purpose is to deliver the right amount of fuel for combustion in an internal combustion engine. This system ensures that the fuel is atomized and mixed with air at the appropriate ratio, allowing for optimal combustion efficiency. By precisely controlling the fuel delivery based on various factors like engine temperature, load, and speed, the fuel injection system enhances engine performance, fuel economy, and reduces emissions.

In contrast, while the control of emissions is an important aspect of modern fuel systems, it is a secondary function. The fuel injection system itself does not directly cool engine components; that function is typically managed by the engine cooling system. Moreover, increasing air intake is related to the engine's air intake system rather than the fuel injection process, which focuses on delivering fuel rather than air. Thus, the correct answer highlights the essential role of the fuel injection system in ensuring that an adequate amount of fuel is supplied for proper engine operation.