Adventure continues... Drain help
Well let me take a stab at it, when the sump runs the velocity of the liquid passing the "Y" in which the sink ties to, is creating a venturi effect causing the sink line check valve to lift from its seat, when the pressure equalizes the check closes creating a slight back pressure in the upstream section of the sink drain piping causing bubbles of air to rise through the sink trap.
Try running the sump without the check valve in the sink line, my guess that is whats causing the issue that is if there is no other check valve further down the line.
If there is another check valve then you may want to replace it, as it may be causing back pressure on the whole drain line piping you have there.
When its all said and done there is usually more said than done
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Last edited by Jackofall1; 01-08-2013 at 05:41 PM.