My pump that does double duty for baitwell and raw water washdown appears to be getting airlocked and won't pump. I know the pump works because I removed the pump from the thru-hull intake and ran it in a bucket. I also know the thru-hull fitting is OK because on plane if the Y valve to change between well and wash is set to baitwell it fills. The pump sits fairly high in the bilge, almost at water level so it's possible that floating at rest the pump housing is dry inside. Would lowering the pump in the bilge to well below the water line fix this problem or is there something else going on I'm not seeing? I bought this boat used and don't know if the current set up ever worked. Baitwell and thru-hull fitting are original to the boat the valve between pump and hull and the pump look much newer than the rest.