Will an engine run on fuel vapor?

[gunsgt1863]

One of many cool videos by Project Farm.

[olderdan]

I don’t see what is the new discovery in this, Jan Ridders runs most if his model engines using a fuel vapour chamber and has a wealth of info and videos on his website including a spice jar carburetor . I have always understood that it is the vapor that is combustible and not the liquid, hence atomizers of various types are necessary. This is why empty fuel tanks are still dangerous and need steam cleaning before working on them. One side effect of a vapor only system is that the ethanol content in modern fuels may be left behind if that suits the purpose. This might work well enough for and engine that is running at a fairly constant speed.