Can you tell where it is leaking from?
Mine was leaking after a rebuild as well. I circled the culprit in the picture attached.
Even after the rebuild it leaked and for the life of me I can't remember why.
I do remember, though, that once I took it back apart (the circled jet), it became clear why it was leaking.
As I recall, the fix was extremely minor and easy. I just wish I could remember what the actual problem was.