What does the fuel flow rate through the cylinders depend on?

The fuel flow rate through the cylinders is primarily governed by the amount of air passing through the fuel/air control unit. This relationship is rooted in the fundamental operation of a fuel-injected engine, where the fuel system is designed to deliver the appropriate amount of fuel based on the engine's air intake. As the engine's air demand increases with throttle input or changing flight conditions, the fuel flow rate must also adjust accordingly to maintain the correct fuel-to-air ratio for optimal combustion.

A properly functioning fuel/air control unit measures the incoming air and calculates the required amount of fuel to match that air. This ensures efficient combustion and performance from the engine. Consequently, an increase or decrease in airflow will directly influence the rate at which fuel is injected into the cylinders, illustrating the crucial dependency of fuel flow on the amount of air entering the engine.