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I'd expect you have either a plugged impeller or a restriction in discharge. either one could cause your symptom accompanied by a loss in pumping efficiency at greater bilge water depth. You might also have a worn impeller which would probably necessitate replacing the pump, although I've never had one apart. If you find the impeller blocked just run some wire through the vanes into the eye-you will hopefully will not even need to remove the impeller to do this. Good luck and let us know how you come out.
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“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.
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