Which part of the Arrow's fuel system is responsible for regulating the flow of fuel?

The servo regulator is the component of the Arrow's fuel system that plays a crucial role in regulating the flow of fuel to the engine. Its primary function is to maintain the desired fuel pressure and ensure that the right amount of fuel is delivered for optimal engine performance. The servo regulator accomplishes this by adjusting the fuel flow based on varying demands from the engine, which can change depending on factors such as power settings and altitude.

In contrast, while the fuel nozzle does atomize the fuel for better mixing with air, it does not actively regulate the fuel flow. The selector allows the pilot to choose between fuel tanks but does not manage the flow rate. The filter, while vital for keeping impurities out of the fuel system, primarily acts to protect the engine and components rather than control fuel flow. By understanding the role of the servo regulator, it becomes clear why it is the correct answer in the context of a fuel system designed to supply reliable and efficient power to the aircraft's engine.