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Thanks guys. This certainly seems possible. I will try to measure the old and new impeller and the cavity this week.
Question for Neil: when attempting to re-face the pump, what grit of sandpaper did you use? Did you wrap it around a block and just go to town on the face? How did you know when you went far enough?
The only thing that causes me any doubt about this diagnosis is that I seemed to have some "crush" on the new impeller when installing the back plate. Still, it's worth investigating. I want to be cautious about just pulling the trigger on a new pump because when it works, this pump moves water very well.
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