I’m running it on and off and other times just letting water sit in the overflow. It has to be the gasket or the nut or thread because it’s coming from that area. It’s all new and clean, I don’t get the issue.Is it currently running fully or are you filling to test leaks? Perhaps there's some debris under the bulkhead?
This time I disconnected my pipe after the union and left a taller fitting inside to see if the tension in the pipe is bothering it. But it didn’t seem like I had any.