What is a consequence of vapor locking in fuel systems?

Vapor locking occurs when the fuel in a system vaporizes due to excessive heat, resulting in the formation of gas bubbles within the fuel lines. This condition disrupts the flow of liquid fuel to the engine, which can lead to inadequate fuel delivery. In turn, the engine may experience a loss of power or even stall, as it relies on a steady stream of liquid fuel for combustion. Thus, the consequence of vapor locking is predominantly reflected in the loss of engine power, which can significantly affect the performance and operational reliability of the aircraft.

The other options do not align with the effects of vapor locking; for instance, improved fuel efficiency, enhanced fuel atomization, and increased fuel density are not typical outcomes associated with this issue. Instead, vapor locking negatively impacts fuel flow, thereby affecting engine performance rather than improving it.