gas fumes seem to be coming thru a/c vents on 05 Monte Carlo

2005 CHEVROLET MONTE CARLO
80 MILES
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KRAMER0848
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can't seem to find any leaks
Apr 10, 2012 at 1:41 PM
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KHLOW2008
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When does the problem occur?

Is the smell very distinct?

Does problem still occur if the vents are turned to recirculating?
Apr 10, 2012 at 3:57 PM
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KRAMER0848
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Not doing it today. This is the 3rd time it has done it. Very distinct smell. Hasn't happened in about a month. Just took a 1600 mile trip. Didn't do it. Haven't tried it switching to recirculating.
Apr 10, 2012 at 7:47 PM
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KHLOW2008
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If the smell is on and off, it could be from the charcoal canister. Is the MIL indicating and have you tried checking for trouble codes?
Apr 11, 2012 at 12:46 PM