The bailers are hooked up to tubes going out near the jet pump. They only work when running. The jet pump acts as a vacuum, and create a suction effect on the tubes, all the way to the bailer tentacles.
Make sure those passages are clear on the hoses, and make sure the bailer tentacles are clear.
Last time I cleaned my ski, I pulled the bailer off the tube, and shot a good amount of hose water thru the lines to clear them out. Also soaked the bailer tentacle pieces in a nice degreaser, as mine were sitting for years. Cleared everything up.