im surprised with as temperamental as everyone is claiming this seal to be,mine is original from92' and never leaked.hope i dont have a problem.

I do not think that the seals are temperamental. 


Most guys replace the seal and it still leaks.  Then they use the shotgun approach and replace everything the second time around.  Using the shotgun approach,  the impellor  and the rubber backed washer gets replaced.  It is the replacement of the impellor and rubber backed washer that usually solves the leak.

Like Carl said........ a grain of debris trapped between the carbon and ceramic faces of the seals will allow the seal to leak.  Inspect the surfaces of the carbon and ceramic for cracks or a radial scratch.  If the surfaces are smooth or have a scratch that goes in a circular path from a grain of debris, the seal is probably ok.