How do you know when your waterpump (is that Impeller?) is busted?

[WalleyePaul]

Changing it regularly sounds like very good commonsense what with it being rubber and all, don't usually last through the winter year in and out.

Anybody give me tips on how to get inside mercury to get where the impellar is? You can private message me if you are willing to come over and check my boat out, and show me physically where it is. One angler mentioned $15 for the impellar, where is that store?
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