Originally Posted by clarktod
You should not need to worry about remembering to open the vent tube. The tank should vent through the fill tube too if you are drawing water with the pump.
I wouldn't bet on that. You have a screw-on cap on your FW fill, right? If so, that may not let enough air in during use to keep the tank from collapsing under vacuum, especially if it's screwed on tight (which it should be.) I'd still want my vent open. Just add it to your set-up checklist. Checklists are your friend...
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