Which component is responsible for mixing the air-fuel ratio in an engine?

The carburetor is the component responsible for mixing the air and fuel in an engine, delivering the correct air-fuel ratio for combustion. It operates on the principle of venturi effect—when air flows through a narrowed section of the carburetor, it creates a drop in pressure that draws fuel from the fuel bowl into the airstream. This mixing process ensures the engine receives the right proportion of air and fuel to maintain efficient combustion, which is crucial for optimal engine performance and fuel efficiency.

While the fuel injector is also involved in delivering fuel to the engine, it does so in modern fuel-injection systems that electronically manage the air-fuel mixture directly and may not necessarily mix the two in a traditional sense as a carburetor does. The throttle body regulates air intake but does not mix air and fuel. The oil pump is unrelated to the air-fuel mixture, as it is responsible only for circulating oil through the engine to lubricate moving parts.