Dave: over the years (the old days) the water pumps on car had a metal impeller... back then the only thing that would go wrong with a w/pump was the seal in the shaft and the coolant would leak out of the weep hole(the little hole under the pump.... the times it had happend to me was like when i did not have any coolant, just water in the vehicle, or when i had the fan belt too tight as it would put too much force on the shaft and mess up the bearing in there and the seal would leak.. i once use some cleaner for the coolant system to get rid of the crap in the radiator to keep the temperature down in the coolant system... the next day the weep hole was leaking so i must have messed up the seal in the pump with the cleaner for the system......
Do you have a clean coolant system??? do you run it with just water in the coolant system??? is the belt on the pump too tight??? this is what you have to look for...
