Good point about possibly drawing in air.  I'll have to look over hoses and pump case carefully.  Never noticed any sign of probs with the pump case, just leaking from what I assumed was the outlet hose.

I'm hoping for an easy fix (maybe a filter) or assuming no rebuild kit is available or that the pumps generally aren't worth rebuilding due to damage that a fairly inexpensive and generally available pump is available to buy and bolt right on.  Here's hoping John will have some good news.