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Since you already have the evaporative emissions purge circuit, the question becomes, what would happen if you introduced another fuel supply through the purge hose connection to the manifold?
The fuel management system would reduce the gasoline supply through the injectors to compensate for the additional fuel supplied through the supply circuit you have created.
Ultimately the oxygen sensor would trim the total fuel supplied to maintain stoichiometric mixture.
I see it as a possible way to use an alternative fuel supply for lower overall cost per mile.
Questions would still remain concerning the location, plumbing, and safety in a collision, when adding something like a propane bottle to your vehicle. I don't think it would be easy to make it cover all operating ranges of your engine, but when cruising at sustained higher speeds, adding a metered amount of propane or another fuel might be a viable option to just gasoline delivery.
As far as a home brewed Direct Injection system, that's a serious stretch, since most DI systems have engines using higher compression to utilize the advantages of DI as far as the direct cooling of the combustion chamber by the fuel injected directly into the combustion chamber itself.
Compressed Natural Gas might be another pathway, but then you have the issue of the CNG fuel containment vessel and the additional cost.
Better vaporization of the propane could be accomplished by using some cooling system heat to preheat the propane, on it's way to the induction point.
Sure would be nice if the same effort at slamming an idea would be directed more constructively.
regards
Mech
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