Ok, code P0455 is for a large evap leak. this requires a high end scan tool and a smoke machine to properly diag. but, with the problem being hard to start after filling up the fuel tank, more than likely the purge valve is stuck open. this will cause the code p0455 to set.
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sorry, the code P0496 also showed up when they put the scan tool on it. Does that change your answer at all?
no not at all, this code just confirms my thoughts. code P0496 is for a bad purge valve. replacing the purge valve should take care of your issues. purge valve is real simple to replace.
the purge valve is bolted to the top front of intake manifold.
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