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Correct. Butterfly valves are installed in the intake manifolds and are usually controlled with pneumatic rams. There is usually a very complex control box that meters air flow and controls propane flow(usually by altering propane manifold pressure). About 10% pilot diesel injection is used to...

The reason gasoline engines are converted to propane and not diesel engines is that the air/fuel ratio must be correct. Gasoline engines meter both air and fuel where a diesel engine meters only fuel. You can't just dump propane into a diesel engine because there is no way to meter the air...