Questions about example sentences with, and the definition and usage of "Vapors"

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Q: What does " on vapors" mean? In the sentence : I hadn't been running on vapors
Please help me.
A: I think that comes from the idea of an engine that has run out of liquid fuel, and is only running on the fuel vapors that remain. As a result, the engine will stop soon.

So if I heard someone say they were running on vapors, I would assume they are very tired and low on energy, kind of like their body is an engine that is about to stop running. Caffeine, sugar, or food may be like fuel for them.

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vapors

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