If aviation gasoline vaporizes too readily, what may occur in the fuel lines?

When aviation gasoline vaporizes too readily, it can lead to vapor formation within the fuel lines, which causes a buildup of vapor. This vapor can obstruct the flow of liquid fuel to the engine, potentially resulting in increased fuel flow due to the pressure from both liquid and vapor phases trying to push through the line.

In an aircraft fuel system, the presence of excessive vapor can disrupt the normal flow of fuel, leading to complications such as fuel starvation during operation. This scenario illustrates how the dynamics of vapor and liquid phases in fuel lines can influence fuel delivery to the engine, which emphasizes the importance of fuel properties and system design in aviation applications.

The other options suggest different scenarios that do not directly connect to the primary effect of vaporization in the context of fuel lines. For instance, while a reduction in engine efficiency and a decrease in fuel tank pressure are indeed possible concerns related to fuel delivery, they do not directly result from the immediate effect of vaporization in the lines as described. Improved fuel atomization relates more to engine performance rather than an adverse consequence of vapor buildup in the fuel lines.