How much does it cost to get a gas smell estimate?

What is your question?

I have a 2007 Chrysler 300 and I am smelling gas inside . I don't see any leaks anywhere. The car runs perfectly. I have checked the gas cap, fuel tank and the oil cap or Orings. What would you say is wrong with it and how much will it cost to get it repaired?

What makes this problem better or worse?

It's seems to be worse cold or if it is hot.