[cjperformance]

Are you referring to the DSX kit? I had a hell of a time when I first installed it leaking at the tank fitting. Just "working with it" and trying different combinations of tightness of the fitting helped... If mine ever shows any signs of leaking again, I'll either:
A) Go with an intank solution (expensive)
or
B) Try to use some kind of bulkhead type fitting that they normally use on fuel cells (cheaper), but not sure if the curved area of the tank where it's add will work.
or
C) Others have suggested going with the next size up fitting for the tank.

Honestly in hindsight tapping the tank was a stupid idea. I had expected more meat to thread things into.