Join Date: May 2010
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
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The cabin air filter doesn't smell like fuel though.
If you think you smell fuel, inspect your fuel system thoroughly -- especially including cold starting since the leak may stop as the material expands due to heat.
Not to sound alarmist but, in general, raw gasoline fumes are the most deadly warning sign your car can give you. If you're not sure how to inspect it, have it done professionally. It could be something as simple as a broken gas cap, or a loose connection.