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The centrifugal pump is pretty lousy at pulling (sucking) water, that's why it needs to be primed. All they really do, is throw water around.
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Wha? If you pushing water out with a given force, you're obviously sucking just as much in. "Equal and opposite reaction". As for priming, thats because pumps can't push air, only water, and is unrelated to push or pull of water.