[paul mora]

You were faced with a problem I see quite often. When you have air in the system you can usually get it out fairly easy. It’s solved quickly. Pumps that whine stay around and usually get louder as the rpms go up. You can play with it for days thinking you have air in the system change the pump and magic no more noise. There are exceptions. I once changed the pump had the same problem and it was a bad pump. I try to stay away from anything made in China