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Old 05-17-2017, 05:57 PM   #1
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Where's The Water

This is odd. We are heading north from FL to CT. Before we left I changed the carbon filter in the "whole house" water filter. Everything was fine for about 10 days. Now at the end of a day of cruising, I need to shut off the breaker to the water pump and turn it on again to get the pump to work. Can the two be related?
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Old 05-17-2017, 06:14 PM   #2
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blocked filter ?
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Old 05-17-2017, 06:21 PM   #3
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Is it an electronic variable speed pump? I had one of the original ones and had to cycle the breaker to reset electronics everytime it stopped. Defender took it back, no questions asked. Went back to basic pumps and expansion tank.
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Old 05-17-2017, 07:16 PM   #4
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I had a variable speed pump in a previous boat. It made lots of strange noises, almost sounded like groaning. The water pressure was never good. I also went back to a standard pump with the large pressure tank.
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Old 05-17-2017, 07:54 PM   #5
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I do not see the link between your carbon filter and switching off/on your pump breaker... Better investigate on the pump side itself.

When you switch your breaker off, d you wait some time to switch it back on or just off then on?
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Old 05-18-2017, 06:30 AM   #6
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Pump is single speed. Breaker gets turned off then immediately on. I have now bypassed the filter. Water pressure at the tap has seemed a bit low. Bypassing the filter has helped that. We'll see how it goes today.
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Old 05-18-2017, 07:00 AM   #7
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Its fairly common for the pressure switch on the pump to fail. That switch is the only thing that turns the pump on and off.

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Old 05-18-2017, 09:46 AM   #8
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What make and model of pump do you have. As I recall, I think you said it was original for the boat. Wonder if it has brushes and they're getting tired.

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Old 05-18-2017, 10:10 AM   #9
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The breaker may be on its way out. If you can, hook a DVM on DC volts as close as possible to the pump. Run the water and watch the voltage while the pump cycles. If the volts are dropping more than say 2-3 volts, the breaker contacts may have high resistance. Resetting the breaker may temporarily make a good contact that degrades over use.
Coincidentally, yesterday I had to replace a breaker that feeds my horn for the same reason. Only 2 volts were making it to the horn. Without the horn connected, perfect 12.7 volts at the leads. The voltage drop cause was the breaker internal contacts.
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Old 05-18-2017, 05:08 PM   #10
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The pump is a Groco Paragon Senior--a mere 2.5 boat units. Removing the filter did not help. When I turn the breaker on and off the pump runs again. Oddly, the taps spurt air as if the pump is priming itself. Can't locate any air leaks or water leaks. When it's working it does not cycle when there is no demand. No water leaks that I can find. No bilge pump cycling.
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Old 05-18-2017, 06:28 PM   #11
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Does it use a traditional well pressure switch? If so, next time it doesn't run, jump the contacts with a wire. Also, you might inspect them for carbon build up or pitting.

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Old Yesterday, 09:05 AM   #12
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The mystery continues. It appears that the problem becomes worse as the level of water in the tank drops. More air "spurts" at the taps and the Vacuflush. When the pump shuts down, simply turning the circuit breaker off and then on starts the pump again---no waiting time. I've tightened every hose clamp I can find, and removed the "whole house" filter. No joy. The pressure switch seems to function perfectly when the pump is running. The accumulator tank was put in new about 4 months ago so I doubt it's that. I don't think it's the thermal protector as the pump turns on again instantly when I "cycle" the CB. The one thing I am suspecting at this time is a failing impeller in the pump.

I've hit the end of my test cycle and have a marine plumber coming on Monday.
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Old Today, 05:13 AM   #13
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"The one thing I am suspecting at this time is a failing impeller in the pump."

Mount your on board spare.
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Old Today, 02:46 PM   #14
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Mystery solved---maybe. Had a tech on the boat today. He began by asking me the details, showing him the pump and water tank locations. He immediately discovered a small water drip from the edge of the inline large particle water filter. The one before the pump with a screen in it. He removed the bowl of the filter and discovered that the gasket had a cut in it and a deformed spot as well. He said if water is dripping out, when the pump runs it is probably pulling air in.

He tried to get a gasket but could not locate one locally. It's an "O" ring but it has a square shape. Rather than hold up our trip north, I coated the old "O" ring and the bowl threads with T-9, a thread sealer that is potable water safe. So far so good. No leaks and no air in the line. I'll order the correct gasket when I get home and install it properly. Sure beats needing a new pump. Sometimes a tech knows what he's doing. Kudos to Atlantic Yacht Basin in Chesapeake, VA.
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