Note in his pic, the tank is stamped "59 gallons". Brochure spec on the unit is "59 gallons", so I'm pretty sure there aren't 2 tanks. More likely just 2 vent/overflow hoses in the top of the one large tank.
If the tank was filled to the point of overflow out of those hoses, then one would be pushing water out while the other pulled air in. Can't cheat physics.
OP, fill it up again, but this time, put your finger over the hose that isn't flowing water and see if it stops. It's possible you have another vent at the gravity fill, but from what I've seen, those aren't used often (factory doesn't, or didn't install them for some reason on many units). My TT vent by the gravity fill was functional though, in addition to the 2 vent/overflow hoses routed from the tops of the tanks down.
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-2018 Greyhawk 29MV
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