What is the definition of fuel flow in GPH?

Fuel flow in gallons per hour (GPH) refers to the rate at which fuel is consumed by the engine, quantified as the number of gallons used over the span of one hour. This measurement is crucial for pilots, as it directly impacts flight planning, fuel management, and operational efficiency. Understanding fuel flow helps pilots estimate how long they can fly with a given amount of fuel, calculate fuel reserves, and optimize performance for varying flight conditions.

While the other options provide context around fuel and its use in engines, they do not pinpoint the precise definition of fuel flow measured in GPH. For instance, the second option discusses the volume of fuel controlled by the throttle but does not specify the consumption rate, which is essential for defining fuel flow. The third option references the total amount of fuel burned per flight hour but lacks the specificity of a rate measured in gallons per hour. Lastly, the fourth option relates to fuel circulation, which is important but does not pertain directly to the consumption rate that GPH represents. Thus, option A is the most accurate and comprehensive definition of fuel flow in this context.