Watched three more Buffys - Angel turned evil and Oz discovers he is a werewolf. :) Good shows!
Got home and the vents were full of water again, but this time just two 16 gal loads to empty before I started drawing air. Maybe last night it was running in as fast as I was draining it? Doesn't bode well for the foundation. The vents are cut into the concrete slab the house is built on. For that much water to be flowing into the vents, there must be a sizeable crack/hole thru the foundation and into the vents. Not great.
Hopefully I'll be able to build a french drain or maybe just install a drain pipe under the walkway, that should keep the water level below the foundation level. Otherwise we are looking at serious buckage to get the foundation repaired.