Video of boiling point of fuel

That's vaporizing but not locking.
I've removed the aircleaner's lid after a hot drive, and that's enough to let a noticible portion of the fuel escape to atmosphere instead of being directed into the intake. Then engine revs as it goes lean, then recoveres and repeats. This is with a open style aircleaner, so the lid is mostly providing airflow direction. Without the light end of the gasoline the burn in the chamber is all messed up. It's like trying to start a fire without tinder.

Vapor lock (at least how I use the term) is when vapor bubble forms in the fuel line. The bubble blocks liquid fuel from getting pumped.