Recently bought an '08 Outback V with the Gravity 1 ballast system. The previous owner never hooked the bag up and never used the the pumps. I finally hooked the lines up yesterday and it filled no problem. I started to empty and when it worked I stopped, filled it back up, kept on going. When I went to empty later that night, it spit out a little and then stopped. The sac will still fill, but will not empty. Any ideas if this is a switch problem or a pump problem.

I'm new to the forums and have found some help here already. Hope you guys can help.