Okay, in militaries or as emergency backup in rural areas, multi fuel engines are used because of the ability to run on any fuel source such as diesel or kerosene.
How does such a engine work without the problems of running on different fuel sources such as engine knocking and spluttering (the classic trying to run petrol onto a diesel engine problem)…
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Military engines tend to have relatively loose tolerances and are built very robustly. They also don’t have to deal with emissions, which takes a lot of the headaches out of retuning the engine on-the-fly if need be.
Of note, though; diesel and kerosene really aren’t that different. Any diesel engine can run on kerosene or jet fuel with essentially no modifications for the short term, and in the long term the only real issue is due to differences in fuel lubricity and sulfur poisoning any exhaust catalysts (which, again, isn’t there on a military engine).
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