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Generally no. You do not want to run an impeller dry, so normally you will apply a light coat of grease to the impeller when you install it. On an outboard engine the impeller is on top of the gearcase and below the surface of the water so it will get water as soon as you start to crank the engine. On a sterndrive or inboard engine the pump can be located on the engine, but it is often mounted low (near the water level). If you crank the engine without starting it the impeller will "prime" itself.

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Q: Do you have to prime impeller to get water flowing through after changing?
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