"Yes the check is put in correctly with the arrow pointing up. So you are saying that on the top U that air cant not be sucked out???"
Take it outside and prime it with a hose.
As you haven't responded to other suggestions...I think you are expecting it to run when its designed to stop.
Take it outside and prime it with a hose.
As you haven't responded to other suggestions...I think you are expecting it to run when its designed to stop.