Trey, I contacted Tanks upon receiving mine, and asked this same question. The vent that they send will only allow venting inwardly, which is fine since the tank needs this as the pump is pumping outwardly. I was concerned that perhaps I needed a vented gas cap, and the tech told me absolutely not.
There is no way that the supplied vent they send can allow fumes to enter the garage. It's a one way vent, and works well on mine, with no fumes in the shop at all. Make sure you mount it higher than the tank, and your golden.
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