I have a 1996 Blazer when I shut it off and get out I can smell gas. If I walk by the Blazer even a few hours later I can still smell gas. I have looked all under and have found no leak since I have fixed the last one, but still get the smell. Any ideas what would cause that?

 

This can be caused by a cracked EVAP canister which is located below the driver rear quarter panel between the tire and the bumper. It is a black plastic box.