Hopefully, if he means the raw water pump it's only the impellor that needs changing; the whole pump is expensive! I change the impellor on mine every 2 years ( I now have 3 spare, used ones in the boat that look brand new, plus the tools/ spare hardware to change the impellor out on the water, should one ever fail !). If the flow from the raw water pump is lower than expected, I'd have thought damage to the impellor vanes would have been obvious when it was removed for the winterising ( the impellor shouldn't be left in there unused over the winter even if the pumpis full of antifreeze, as the vanes can develop a "set") . A reduced level of water coming out of the exhaust/ outdrive can be caused by blockages in the manifolds, risers as well as due to the pump.
The engine recirculation pumps usually indicate they are failing by starting to leak water out of the weephole on the underside.
Graham
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