Originally Posted by hdmtnrider
5picker, I think RSchleder is talking about wrapping tape around filter cap and not vent cap.
Well... maybe he was... but he specifically said 'filler cap' and 'filler neck'.
That made me believe he was talking about the port on the side of his unit where you add fresh water to the tank.
None the less, the fresh water tank is a vented system and needs air to replace the water as it is drawn out of the tank. If you don't vent the tank, it won't draw water very long. The analogy to the kid sucking on a straw in a juice box was spot on.