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That's rather strange......any leakage, vapor or liquid, would cause the periodic tank vacuum self test to fail, resulting in a check engine light.

There have been incidents, all car brands, where a fuel injector seeps onto the manifold and the fuel evaporates off but you are indicating no underhood odor.

I think you will have to go to a dealer for a 'smoke test'......to test the integrity of the fuel supply system.....maybe a cracked vapor cannister for example.

Rob
 
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