I think my gas tank is leaking

Crawled underneath the car yesterday for a random inspection just because, and saw what appears to be fuel leaking from the tank. Might be hard to see in the pic, but it looks like it was leaking from where the tube connects into the tank then trickled down making the rest of it wet.

As far as gas tanks go, looks pretty straight forward to remove but thought I'd ask here for advice first.

http://imgur.com/ETrsXo8