Other Fuel System Tank Mounting problems of the 2003 Audi A4

There seems to be a fuel pump or other issue along the fuel line. Recently, the gas cap indicator has gone off, and won't turn off. I even tried replacing the gas cap with a new one. I checked for loose parts on top of the gas tank (through the trunk). No visible issues, but I do smell gasoline on humid days, there is clearly an issue along the fuel line. I noticed there were recalls by Audi for different vins (not mine), that highlight issues with the fuel system and fuel pump - recall number 06v017000 (01/23/2006), and 07v375000 (08/28/2007) (others?). I've tried calling Audi to see if they'd be willing to investigate whether a broader number of vins need to be included in the recall (including mine), and they refused to cover costs to look into it.