simple things first. Could there be something covering the intake? if the boat is sitting slime can cover the intake.
I did have the same problem last year. Finally realized that the gasket on the pump cover was too thick! (PO, grrrrs) you must use the very very thin gasket made for the pump. "homemade" from gasket material was way to thick and the space kept the pump from priming. Also got a new impeller cover since the old one was worn. We also found out later the the anti siphon loop was by passing some water from the muffler. Pretty happy with the output now!
Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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