What is a common consequence of increased vapor in the fuel lines?

The correct response acknowledges that increased vapor in the fuel lines can lead to decreased fuel flow, which is a critical issue for engine performance. When vapor is present in the fuel lines, it can disrupt the continuous flow of liquid fuel to the engine. Vaporization reduces the net amount of liquid fuel available, leading to issues such as vapor lock and reduced pressure within the fuel system. This ultimately makes it harder for the fuel pump to deliver the necessary amount of fuel to the engine, resulting in a decrease in overall fuel flow.

Decreased fuel flow can adversely affect engine operation, leading to power loss, increased engine temperature, and potentially even stalling. Therefore, understanding the impact of vapor in fuel lines is essential for maintaining engine efficiency and reliable operation.