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Old 09-03-2018, 01:44 PM   #1
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AC raw water pump

Any suggestions on pumps? My March
AC-3CP-MD gave up today. Got power to it. Plenty of screened Water going to it, but no output. Should I just buy another March pump, or are there better options? I have no idea how old this one is. It was on the boat when I bought it. Thanks, Don
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Old 09-03-2018, 02:24 PM   #2
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If the motor runs it maybe an o-ring is leaking and the pump drawing air. Make sure the pump body is flooded. If you're not using an intake strainer, you could have a plug. You can but a wet end kit for about 1/3 of the whole pump.
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Old 09-03-2018, 02:28 PM   #3
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March and Cal are the two I am familiar with and between the two, the March gets better reports.


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Old 09-03-2018, 03:35 PM   #4
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A March pump came with ours and was running hot and making bad noises. A close look showed thereís two oiling ports. Now I oil those twice a year and all is well. I did have a spindle break after acid washing sent something crunchy into the pump. $10 from Depco and we were back in business. I do carry a new in the box spare but donít think Iíll be needing it for a while.
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Old 09-03-2018, 03:42 PM   #5
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When I checked the pump right after it quit the motor was hot. I bought it home , hooked it up and it started right up and pumped a strong flow of water. Iím going to let it run for awhile and see if it quits again. Im going to replace it regardless, since itís done this once before.
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Old 09-03-2018, 05:07 PM   #6
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Try oiling the motor. Worked for me but I still carry a spare.
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Old 09-03-2018, 05:33 PM   #7
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Speaking of Depco, give them a call tomorrow and discuss your situation. They will have some expert troubleshooting advice and get you the right pump, if you really need one, or the right parts, or refurbish yours.

However, it sounds to me like you have an upstream airlock in your system, usually caused by a sagging hose preventing you from having a continuous uphill route to the compressor system. You certainly have the symptoms.

March makes very good pumps, though I'm an Oberdorfer man myself, and I certainly wouldn't switch out a March just for the sake of it.
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Old 09-03-2018, 06:05 PM   #8
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I have had good luck with March pumps.
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Old 09-04-2018, 04:11 PM   #9
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March pumps seem to be very reliable and last years. I just had to replace one this year as well. I installed it 7 years ago. It had power but was not pumping. The other pump on the boat was there when I bought the boat 7 years ago. It's still pumping fine.

I disassembled it. The magnet drive shaft was eccentric, that is, it wobbled. It caused the driven magnet surround to rub and eventually seize on the exterior shroud. Looked like a factory defect to me. I cleaned it up, sanded some of the burrs off the surfaces, greased them, and put it back together. It's now a spare on the boat.

The motors are sealed. Have no idea how you can oil them?
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Old 09-04-2018, 04:38 PM   #10
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I recently went through this for an ac genset pump
March are a US thing so prohibitively expensive here so I purchased a resun/iwaki md30.
Very solidly built, heavy and rated for continuous use of saltwater.

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