Join Date: Jul 2008
Location: Jacksonville, Fl
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Most raw water pumps are made by Jabsco or Johnson. The smaller ones are pretty critical on the fitting of the impeller, particularly from front to back. If it isn't snug, there's no seal, and no water gets pumped. If you can blow through the pump, I'd say you have the wrong impeller installed.
Take the cover off the pump and lay a good straight-edge across the opening. The rubber on the impeller should be touching, just barely. (Too tight and it won't work, either.)
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