I think I may have sprung a leak in my gas tank. Its not the filler neck because its on drivers side....

Its not a hole in the bottom because it seems to only leak when I fill up the tank and I have the car angled with the driver side lower than the passenger side.

Before I start ripping things apart, what should I specifically be looking for to leak? I already tried taking off the two covers in the rear cargo area (to get to fuel pump) and couldn't see any leaks in either of those...

Am I going to be stuck dropping the tank?