George, help me out here. What is the reason for the line to the pump inlet? Would the venting issue be resolved by moving your air bleed from swirl tank to the bottom of the overflow tank, eliminating the line to the pump? The system would still vent and with the swirl vent line in the bottom of tthe overflow tank, as the system cooled it would draw liquid back into the system. I'm just a little fuzzy about the pump connection.
Angelo
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