The engine circulating pump is in the spot that an automotive water pump occupies. It is belt driven and has a rigid impellar, it does not have to self-prime. These will eventually have a bearing failure and leak just like a car.
The raw water pump is belt driven and mounted low on the engine. It has a rubber vane impellar that needs regular replacement. My first boat failed after four season and around 380 hours. My current boat is a Volvo but I just had them replaced and they were on their way out after 5 seasons.
I guess the bearings will fail eventually, three seasons seems a little short. But they don't make things like they used to. Ask for the used parts.
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