What is the primary purpose of the fuel system in a gasoline engine?

The primary purpose of the fuel system in a gasoline engine is to supply fuel to the engine for combustion. This system ensures that the engine receives the correct mixture of fuel and air, which is essential for the combustion process that powers the engine. A well-functioning fuel system delivers fuel at the right pressure and volume, and at the appropriate times, to ensure efficient engine performance and power output.

By supplying fuel to the engine, the fuel system plays a crucial role in the overall operation of the engine, helping to optimize combustion efficiency and reduce emissions. Proper formulation of the air-fuel mixture is integral to engine performance, and any issues with the fuel system can lead to problems like poor starting, rough idling, loss of power, or increased emissions.

In contrast, other options present functions that do not accurately reflect the primary role of the fuel system. For instance, regulating engine temperature pertains more to the cooling system. Converting air into fuel is not a function of the fuel system since the system manages fuel, not air conversion. Enhancing exhaust emissions does not align with the primary function of the fuel system, which is to promote efficient combustion instead.