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Looks to me like both trails lead to the pump mounting bolt holes, go around and then into the impeller cavity.
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So perhaps the pump bolts go into the water jacket and required sealant (e.g.
https://www.amazon.com.au/LOCTITE-11.../dp/B004QXL4F2 ) was not put on the bolt threads. But even then; water flowing upwards against the force of gravity?