I have a Hayward Super II self priming pump. I think I may be having some issues with. It seems like its not pumping water from the pool to it's full potential. The line from the pool to the pump does not seem to be obstructed, used a water weenie. If the pump were going bad, is it possible for it to be "weak" or would it just stop working all together? I am not getting any pressure at the filter and return flow is weak. I have replaced several gaskets at the pump and the filter thinking it may be an air leak....no dice.