I just rebuilt my PS pump to stop a slow leak and try to save my smog pump. At idle I can feel a pulsing in the hose and when I turn the wheel it becomes a load knocking. Before the rebuild I had some of this sound but only when pushing against the stops. I've been through the bleeding process, fingers and pump. No foaming fluid. Do I: dig into the pump and see if the springs and o-rings seem OK, dig into my pocket and buy a new pump or hope for a magic solution from you all. Any advice?