I'm a beer keg newbie. I'm on my third keg and i am still having problems. I tapped the keg on Christmas Day after leaving it for 24 hours. Temp is 39, pressure is 12 running a 5ft line. It poured great for the first day, with the occasional foamy pull. The next day we noticed the keg was leaking from the coupler. I cleaned it up reconnected the coupler and had little pressure. I added an o ring and let it sit. The pressure came back and it doesn't leak, but every pull is 90% foam. I let it sit for another day, dropping the pressure to 10 and releasing the pressure value on the coupler. Still foam...what gives...it was working well. Can anyone give me some suggestions.
I was in a similar situation as you. I fixed it by venting the keg completely, then sealing everything up and attaching the gas line. I left the pressure off at first though. I slowly rolled it up to about two pounds and poured. I continued to increase the pressure very slowly and now keep it around 8 pounds. It sounds like you are over pressurized when serving.