water pumps used to be a "rebuild" item...
there are only two places it can leak...
the main seal where it bolts to tha block, or around tha shaft...
if the unit you bought wuz a rebuild, and itz leakin round tha shaft, it wuz a simple case of piss poor work by tha rebuild shop...
shoot them suckers...
if it iz leakin round tha main seal to tha block, tha installer iz a dirtball, and did a poor job with tha gasket seal...
whip him...
love and kisses,
rookie