Negative chamber filling up on a solo air

Hi all, I released all the air from a recon solo air the other day, released it all with shock pump, removed it, cycled it a few times, reattached it, the pump read 50psi again, released that, all empty. I assume that the reason it refilled with air was because of the negative chamber. Pumping air back in, how do I make the air refill the negative chamber? Is it automatic? Thanks
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