I agree with ToddTruby's comments about diagnosing this over the internet.
I presume your son means a raw fuel smell, not a rich exhaust smell

Unless the miles are very high or there has been an accident every fuel leak should be covered with the possible exception of the gas cap.

I disagree with ToddTruby that there is any condition or circumstance where smelling fuel should be considered normal or ok.
I also believe a fuel injector could leak (on the fuel rail/delivery side) without setting any performance problems or trouble codes.

Take it to the dealer ASAP and expect it to be under warrantee.

Hope that helps,
Steven