I came across this problem when I first got my jeep! The gas pump would not stop when it was full, so gas would gush out!! I smelled gas in my Jeep for almost a week, then when I fill up it would happen again.
I took it to a dealership and they replaced the whole gas tank for free, apparently there have been a lot of complaints about this! Also, check your gas gap, or take your Jeep in to get it inspected. Could be a fuel damper or filler neck that has a leak! Best of luck friend