First, a good manual bilge pump would work better, and let you pump longer and faster than a bucket would... and second, using the engine to empty the bilge is IMHO a relatively stupid idea, as most sailboat diesels pump relatively little water and running the risk of compromising the engine when its power may be needed most is not very smart. Most bilges have a fair amount of debris and such that are likely to clog the engine cooling passages.
To be honest, if I'm ever in a situation where I need both pumps to keep the boat afloat, I'm breaking out the bucket and switching the engine intake to bilge intake!
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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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Still—DON'T READ THAT POST AGAIN.