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Old 06-07-2009
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Sounds like the pump is not picking up a prime on restarting. The black water is just some soot that accumulated in the exhaust when no water was flowing. You may need a new impeller or more likely the clearances in the pump have opened up over the years. Sometimes removing the cover and if scored, filing it smooth will solve the problem. I doubt a strainer will help your problem. Note that I only close the seacock of my raw-water cooler Universal diesel at the end of the sailing day, not every time I shut it down. If you have to do that to keep the pump primed, fix the pump.
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