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Running an engine on propane & natural gas is nothing new. Some outfit even makes propane powered weed wackers, they make them for Craftsman also. City buses & gas company vehicles are run on natural gas.
Your fuel has 3 options to get into the cylinder
1 - go in with the air - Carb or manifold injection
2 - Shot directly into the cylinder - Diesel or new gas direct injection
3 - Beam it in Scotty
Making sure it is all in vapor form when it starts to burn is key. That's why you see fuel rails in hot places in the engine bay. Heating a liquid fuel so that it evaporates in the line causes too little fuel to go into the engine, ie vaporlock.
And it's Zora Arkus-Duntov
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