Does the bow bag ever get water?

Sound like the hose on the port side from tank to bow bag is the problem. The fuel tank is under the floor panel and straight forward removal, it just looks painful.

Once the fuel tank is out the hard tank slides toward the back and is removed out of the same hole. As for lines and what to remove, go slow and take pictures to remember what part go where for reassembly.

Really sucks you can see the water, but there zero access to the hose. Have you checked for an access panel under the port locker. Mine is carpet but I have never pulled it up to check for an access cover.