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Try tightening the 4 bolts that secure the 2 parts of the housing (9/ 16" wrench will fit them).

If that doesn't solve the problem, pick up a SPX1600-Z-1 seal assembly and a SPX1600T pump housing gasket. I know I have a post describing how to change the seal assembly and the housing gasket is pretty obvious but feel free to ask any questions you have.