08-25-2010
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Telstar 28
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Join Date: Mar 2006
Location: New England
Posts: 43,315
Rep Power: 11
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In theory, most bilge pumps should be wired for both manual and float switch operation. The float switch is generally used when the boat is unattended. The manual switch allows you to overide the float, if the bilge has just a bit of water in it, less than needed to activate the float switch, but possibly enough to need pumping out.
Having an off position is really useful. For instance, say you spill some diesel fuel into the bilge—you would want to turn the bilge pump off so as not to pump diesel overboard and incur a large EPA environmental remediation fine.  It can also be useful in the spring, when cleaning the bilge, and you don't want to have the mixture of water and detergent pumped overboard.
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Sailingdog
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Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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