I have had a strong odor of gas in my 2009 Jeep Commander cabin for about 2.5 weeks now. I had it towed and taken in for service to my dealer, they said that the canister was cracked and replaced it. After I picked it up, I realized that there still was a HEAVY gas smell. It is abnormally strong. The dealer even bombed it with a smell to cover it up, but it didn't really work. I am concerned. The smell never went away. I am going to take it in again for service tomorrow...any ideas on what could be wrong?