Fuel injected engines add a layer of complexity to aircraft systems. Justified sometimes, put undesirable in for other types. One of my first certification projects back in the late 80's was to remove the injection system, and revert to carburettor for the Cessna 185, it was a great simplicity for the plane, and improvement for float operations.
This is one of my present projects, I'll be doing the testing and compliance for this engine into the deHavilland Beaver and STC approval. I'm expecting to be involved in ground run test early in the new year, and hopefully flying it in the spring:
https://www.wingsmagazine.com/sealan...ed-a03-engine/
I'm looking forward to this new technology engine (being a VW diesel owner for decades), but it's use in an airplane has presented the need for some complex fuel and electrical system changes, and will require agreement from the authority for special certification conditions.