I'm going to put a small autoballast system in my ski locker. I'm going with a Flyhigh sac. Two Tsunami pumps, 1 fill, 1 empty. So the sacs have 2 fill/vent ports on top & 1 drain on bottom. Fill through one of the top ports. Drain through bottom. My question is... Do I need to to run a vent line from the second top fitting? Or do I vent through the drain (non running) pump through the lower fitting & out the side of the boat. Will venting through the drain pump get all the air out?
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