That's most likely a result of the cap venting. How long after re-closing the cap until the noise returned? A plumb full tank will see a shorter time interval. The gas tank will gain heat after parking as there is no rush of air to cool it and the engine is giving off lots of heat with nowhere to go but up.
Yeah, if you want true ram air tuning, you better be willing to ram some air! (SteveinSunnyFlorida)
'99 Concours(with 234,xxx miles on it), sold
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And most of Canada too, eh?