Kevin,

If this plug is a simple tapered pipe plug (NPT), ideally, it should self seal. If it doesn't, gooping it up with something might solve the problem. My first thought would be to tighten the heck out of it and see what develops.

I think they made a plug with a face seal gasket as opposed to a tapered pipe plug. This type would require it to be removed and a new gasket or sealing washer installed.

You won't break anything if you oink on your leaker...give it a try.

Stuart