Jeep patriot 2012 check engine light small evap leak?

So I had a check engine light come on for small evap leak .I wen't to the jeep dealership and got a new gas cap for my jeep. The light went away before I even started it I drove it all over for 5 days and the light came back with the same code one of the colder mornings.I'm wondering what I should check... show more So I had a check engine light come on for small evap leak .I wen't to the jeep dealership and got a new gas cap for my jeep. The light went away before I even started it I drove it all over for 5 days and the light came back with the same code one of the colder mornings.I'm wondering what I should check next?Thank you!
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