I don’t think it was as much about turning it into vapor as a plasma. When most hydrocarbons like gasoline are heated to 3-400° they stabilize into a plasma. I think what the trick was they claimed with some of those vaporizers was that when heated to a plasma like that, other liquids of at least 30-40% hydrocarbon began to perform well enough to “allegedly” run through the same engines. The trick was that the vaporizer had to be configured in size and temperature for each specific fuel. And the way the manufactures first tried to stop ppl from using these even before injection was the catylatic converter. I’m not sure if they existed yet or not, but they did make it mandatory for the catalytic converter to be mounted directly off the end of the header, which was exactly where you needed to run those vaporizers to achieve sufficient temperatures. So you couldn’t achieve those temperatures further down in the exhaust.