2006 P0442 & P0456

Suzukigs750ez

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Hey guys. I'm getting a fuel smell from (I think) the passenger side of the engine bay. It's strongest at the initial startup. P0442 & P0456 come up consistently. No driveability issues as far as I can tell. Any way to further diagnose without a smoke machine? CEL came on once, I cleared it and now they come back as history codes. Help!
 
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