Gas leaking from middle stern below drain plug

[Destroyer]

Check your fuel line connections where they attach to the tank, as well as the lines themselves... If the connections are tight and the lines are sound then you have a problem with 3 possible solutions.

1) Replace the tank
2) Repair the tank
3) use portable tanks

Each has it's good and bad points.. Replacing it involves a lot of work. Repairing it is just as much work and is the least attractive in my estimation. Using portable tanks involves storing them and taking up space on the boat.
So the choice is yours. Good luck.

PS...if you should go the replace tank route, there are a lot of guys here that have done that job and can help with suggestions, etc.

[Skools Out]

does it have a fuel filter? if so it may be your leak plus check all thew fuel clamps too.

[SkunkBoat]

Assuming you have a belly tank?

The tank compartment is a "dry" compartment. It doesn't drain to the bilge.
The fuel would really have to be filling up the foam and leaking over the top of the tank.. I would definetely check all connections as the others said, Check the gasket on the sending unit....filling up and tilting the boat can cause it to seep.. Definitely remove the hatch cover and inspect.