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My 1978 MDJE-3CR (7.5Kw) did the same thing. I believe I had to mess with the rotary switch. (It was about 4 years ago. Sorry my memory is so vague.) If you don’t have one already, download the technicians repair manual. The manual is designed so that any idiot can trouble shoot using flow...

If the paint starts to flake or peel, your bilge pumps may clog just when you need them the most; that’s what I tell myself any time I start to think about painting my bilge.:)

Any electric raw-water pump installed should be wired directly to the generator head. Don’t buy a cal pump—March is a quality pump; however it is also a centrifical pump. Make sure it is mounted below the waterline.

Replace it with a March 120VAC AC raw water pump and be done with it. I have the same pump as yours on my Onan mdje 7.5 kw. It tends to vapor lock when I raise the sails in moderate winds or seas. I always check for water flow throug the exhaust outlet whenever I start the gen set. When I run...