gas odor 2004 accord

I saw a couple of posts a few weeks ago about people experiencing the smell
of gasoline with their Hondas when the weather was cold - but the thread
died I guess, because I saw no more - and no one offered an explanation,
only the experience

I too have experienced this once and am rather concerned
it must mean that some gasoline is leaking or escaping - and although the
cost of the gas is a factor, more important is the fire hazard - with me,
the smell lingered for 15 minutes or so (though some of the time could be
explained by trapped air or lingering evaporation)
could there be a place that would vent off excess pressure - though why
would there be excess pressure?
??

Dave.