Originally Posted by Soo-Valley
Ski, I get how it works now.
I do not get how the fuel is prevented from igniting at the intake end of the tube before the fuel/air is mixed out the other end.
My guess is that as the fuel evaporates, it dramatically cools the small amount of air inside the tube and there's just enough of a temperature drop that it won't ignite. Once it hits the outlet end of the tube, it's nicely mixed with the air and ignites instantly.