Was wondering if any one was having the same problem....when i put the tabs in the "bow down" position the pump unit sound as it should and it "bottoms out" ...when i retract the the tabs it makes like a winey sound almost like it is getting air....and does not top out like when the bottoms do when the "bottom out"....they do retract but the motor still sound like the line is not bled....plenty of fluid....? Help and thank you