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How to avoid clogging your engine with sand

Says you. Maybe I do not have your expertise but I am an engineer by education and a mechanic by experience. I have owned jet pumps boats and skis since 1990. I have maintained, modified and rebuilt numerous Kawasaki, Yamaha and Rotax axial flow single stage jet pumps. The procedure I use to clear the pump works for me so we just have to agree to disagree.
I'm not saying your approach won't do anything, but it will be WAY MORE EFFECTIVE if you turn off the engines.
 
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