John,
You explained perfectly the same smell and location we had last year. Our smell was unfortunately linked to the fuel pump assembly pushing vapors past it's body sealing o rings. It was hard to diagnose because I was looking for a drip based on how strong it was. Not a cheap fix but we don't have a hint of fuel smell this year after replacing it
http://www.smwebhead.com/phpBB3/viewtopic.php?f=6&t=13673Of course this is assuming you have Volvo's
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