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I too, have bad access to the raw water pump. It is a Moyer flange pump. FWC. Recently I tried to buy the impeller tool, but they are sold out. So, I removed the pump. I still was unable to remove the impeller. It was really stuck on the shaft. So, I drove the shaft partway out until the impeller was almost free, then I could pull it out with pliers. After driving the shaft back in, I installed the new impeller, using never-seize on the shaft. I worried about damaging the seals, but apparently they are ok. The end of the shaft had made a divot on the inside of the back plate, from the shaft being driven in to far, although the flange on the shaft should have prevented that. I think this created heat that fried the impeller to the shaft. It all works now.
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