What issue can occur when a fuel does not vaporize readily enough?

When fuel does not vaporize readily enough, it can lead to vapor lock. Vapor lock occurs when the fuel in the fuel lines or carburetor vaporizes due to heat, and these vapor bubbles disrupt the normal flow of liquid fuel to the engine. This can result in engine performance issues, including intermittent power loss or stalling, as the engine cannot receive a consistent supply of liquid fuel.

This phenomenon is particularly problematic in aircraft because consistent engine performance is crucial during all phases of flight. Factors contributing to vapor lock include high ambient temperatures, long fuel lines, and how the fuel is routed through the system. In contrast, engine overheating, low fuel levels, and fuel contamination are separate issues that would not directly arise from the inability of fuel to vaporize properly. Understanding vapor lock helps pilots and maintenance personnel in diagnosing and troubleshooting fuel system problems effectively.