I have a 2002 Mobius. I just replaced the Rule 1100 pump on the ballast system but the bags still don't fill even though I can tell the pump is working. We gave up trying to figure it out and turned off the pump. When we got done wakeboarding we noticed that the bags had filled about 1/2 full even though the pump was not on. Any ideas why this happens? Any ideas for fixing the pump problem so we can fill the bags as soon as we get in the water?