The way I do it is to atomize my fuel with an injector in each intake runner. Then the valve opens and the piston sucks it in to a very hot cylinder where as its compressed 11 times normal becomes a vapor. Then the spark plug lights it off.
The other way I used to do it on my pickup was by running propane which easily flashes to a vapor without heating.
Why you would want to do it outside of the saftey of the combustion chamber with regular gasoline is a mystery.
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