There's not much you can do except for put a new gasket on it n see if it'll leak or try n make like a little cover to put over it. But yeah not much todo mines leakes through there too.
It'll stop eventually when the fluid gets too low to reach the top. Stupid solution but its the only one I've found so far.
Then just put a new gasket and see what happens.
Jb weld
ima jb weld your asshole shut
Your mom will get all angry if you do that.