I have a IS250 AWD LEXUS and every time i start it after it's been parked for more than a few hours, morning and after work, I have the smell of gasoline inside the car for a few minutes. If I change the fresh air setting (default is coming from outside) to circulate inside air only, then the smell is gone. I took it to the shop to have it inspected for any fuel leak but there is none. hepa air filter will help if I have it replaced? or what can I do?,,,,,,,help!!!!