I've got the same tank installed, no apparent leaks, no fuel residue in fuse when filled, just leaking fuel from carb when I try to start it. Also it doesn't seem to be pressurizing like before. Before this problem I could turn the prop over by hand 10 - 15 times & I'd get a good hissing sound when I disconnected the pressure line, now I get a weak hissing when I turn it over 30 times.
Think I'll just pull it out again & try running it on my test stand with a different tank, maybe I'm just missing the obvious.