This may or may not be your issue but I had from what I've been told was a common problem similar to yours. Fuel leaked when topped off and would dribble on the exterior quarter panel.
Turns out my fuel lid wasn't sitting correctly but that wasn't the problem...it was my filler neck. One of the tabs where the lid would catch was tired and worn. In some casses it can be bent back a bit but in mine it was just best to purchase another used one.
Check that your fuel lid closes correctly and doesn't make any sudden movements towards the end of the turn. Not sure if that makes sense but feel free to pm me as I have the old neck still and can take a short video if need be. Hope this helps someone.
Turns out my fuel lid wasn't sitting correctly but that wasn't the problem...it was my filler neck. One of the tabs where the lid would catch was tired and worn. In some casses it can be bent back a bit but in mine it was just best to purchase another used one.
Check that your fuel lid closes correctly and doesn't make any sudden movements towards the end of the turn. Not sure if that makes sense but feel free to pm me as I have the old neck still and can take a short video if need be. Hope this helps someone.