What is a common symptom of fuel vapor lock?

Fuel vapor lock occurs when fuel vaporizes in the fuel system, typically due to high temperatures or low fuel pressure, which prevents liquid fuel from reaching the engine. This can lead to inconsistent fuel delivery. Hence, fluctuations in throttle response can be observed, where the engine may not receive a steady flow of fuel, resulting in variations in power output and engine performance. This symptom can be particularly critical as it affects the engine's ability to respond predictably to throttle inputs, which can be dangerous during flight operations or takeoff, when consistent engine performance is crucial.