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What is source of gasoline smell outside car, only with engine off 2-3 hrs.?

(2004 Saab 9-5)
in Rockville, MD on June 21, 2013
the smell is intermittent and sometimes after non-use overnight;
no codes on it and nothing showed up on system pressure test;
sometimes no smell for weeks then starts again; gas cap ok; worse in hot weather; full or low gas tank no difference

bad exhaust/catalytic converter?
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