Mr. Chips, If you are still there and still have all your parts; listen and listen carefully. You are playing with a ticking time bomb. There is no safe fix for an air compressor tank that is 'whistling' out the bottom. It is only a matter of time before it is going to explode and take whatever is nearby with it. Shut it off, let the pressure bleed off, and go see Sears/Craftsman about a new pressure tank. A new tank is only a couple hundred dollars versus being maimed for life.