Raw fuel smell, Dealership has been working w/ car for over 6 months. What next?

Have a independent shop diagnose this http://repairpal.com/subaru-repair-in-tucson-arizona sometimes they can find something the dealer overlooked

Check fuel filler neck for rust holes or loose clamps causing smell behind R/R tire. Also an aftermarket cap will not seal properly and will vent through the cap sealing surface