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If this is indeed the problem, you need to plumb a second line from the bottom of the surge can to somewhere near the pump intake to motivate the water to flow to the can from the vent line.
Not to get stuck on semantics, but doesn't adding a return line to the surge tank turn it into a purge tank? My purge tank is connected to a separate surge tank whose sole purpose is to catch any overflow. The purge tank has a return line back to the wp inlet. Also, the purge tank has a 25# pressure cap while the surge tank is vented to the atmosphere.
Mark S.
(my brain hurts now)
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