My 2000 Dodge intrepid smells like gas very strong but I can't find a leak

What is your question?

My car had a bad gas smell but I can't find a leak anywhere I even took it to three mechanics and they couldn't find it either.I took the head off and checked the fuel injectors and o rings but still see no leaking so what else can it be

What makes this problem better or worse?

It's smells stronger when turning my heat on

How long has your 2000 Dodge Intrepid had this problem?

About a week