I don't know if this is the case with your water pump, but I bought one from IAP that had a steel plug in a hole for a mechanical tach drive. It leaked through the plug. I removed the plug, put gasket sealer on it, then reinserted it.
There are a couple of threads on alfabb.com < https://www.google.com/search?q=alfa+water+pump+leak+tach+site:www.alfabb.com&biw=1455&bih=941 > Leslie Wong 1979 Alfetta Sprint Veloce Oakland, CA -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]

