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Thank you all. I am afraid that the answer was (as per usual with me it seems) simpler and more embarrassing than everyone was thinking. I took the pump off the boat so I could bring it home and get the stripped bolt out of the backing plate and take the back plate off. It seems that I displaced the keyway when installing the new impeller and so of course the impeller was not turning. got a new keyway in there and im pumping raw water beautifully! now to fix the engine coolant system...
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