I have seen seen several pumps leak out the weep hole after they have been rebuilt. The cheap kits use an impeller that just has a machined surface for the seal to ride on. Any imperfections will allow coolant to leak out. The IH kits use a ceramic disk with a rubber seal pressed into the impeller. If the ceramic cracks the pump will leak. It is also possible that the bellows in the seal itself are damaged.
Verify that the leak is indeed coming from the weep hole. If it is you have a defective pump.
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