Just polishing the crystal ball now - will be back with answers following a reading.
However, in the interim - if damaged from running dry it seems as though there wasn't any product available for the pump, why is this so, who knows - we certainly don't, only you can give the answer (maybe the crystal ball will help).
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)