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I'm aware of some direct-injection engines being fitted with 5th-generation CNG kits, yet it requires a small amount of the original fuel through the stock injectors in order to prevent them from getting damaged, while the CNG goes through sequential port-injection. Maybe it's not so much of rocket-science to try a similar approach if you're really willing to try the LPG fumigation enrichment in a port-injection engine, considering the LPG replaces some of the oxygen flow through the intake while it expands.
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