as we were leaving the boat late last night my wife used the head one last time. when she began the standard hand pumping she noticed there wasn't any suction in the handle. i checked the open/close switch and tried it in both positions, but nothing. it sounded like it was sucking air. i also closed the head pick up but still nothing. we didn't have time to check any of the lines last night so i thought i would ask everyone here if they have esperienced anything like this and what might be the reason...it is a new manual head that worked perfectly last year...thanx...J&R