It seems to me that you need to burn the gaseous fuel within a certain range
of mixture strengths. I guess you would have to inject the pressurized gas
into the engine after the port closed to avoid simply expanding the gas and
displacing air in the intake manifold. A simpler way would probably be to
just use a turbocharger to compress the fuel and air after they mix in the
carburetor (or "mixer," as gaseous carbs are usually called). I think the
turbines need higher pressure gas because they inject the gas after the
compressor stage. I really don't know a great deal about any of this!

Jon

 
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