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I thought the whole "getting fuel past the rings" was a problem with carbeurated engines where they dumped too much fuel in at idle. With Fuel Injection the amount of fuel is more acturately metered so that only enough is put in to keep the engine running.
On these engines actual fuel has to get out of the prechamber and survive the detonation of the whole fuel-air mix before it can even think of getting past the rings.
So I don't think letting a diesel idle overnight would be a problematic idea, you might make your neighbors mad with the noise and the smell, but thats about it.
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