Well I had water sitting in the tank and it wasn't leaking and so today I put methanol in the tank and tested it to see where it was leaking from. This time it was definitely leaking and it was coming from one of the swivel fittings that feeds the tank with methanol. I could tell that it wasn't coming through the rubber gaskets, but rather from the top of the swivel fitting near where you insert a hex to tighten the fitting to the tank.
Richard are these the type of fittings that you are sending me? If so I will make sure I replace the leaking one.
The arrow shows where it is leaking from:
