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10-13-2017, 08:46 PM
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#1
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Senior Member
Join Date: Nov 2015
Posts: 4,223
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Water pump cycling on/off
Dry camping at Talladega this week and found an “issue” where the water pump would cycle on/off about 3-4 times a minute. It only stays on for well under a second. All the outlets are shut off and no leakage can be seen.
My water fill system is the single line one where you move a valve between two positions...one to fill the FW tank and the other to use an external water source. When I filled the tank prior to settle up camp I left the valve in the “tank fill” position. When I moved it to external position the cycling stopped.
All is good now but I’m curious about the reason for this to happen.
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10-13-2017, 09:35 PM
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#2
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Senior Member
Join Date: Jul 2017
Location: California
Posts: 7,616
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More than likely air in the system..
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10-13-2017, 09:41 PM
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#3
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Senior Member
Join Date: Jun 2013
Location: Between Pickles Gap and Toad Suck, AR
Posts: 6,070
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When mine was in shop in August for slide issue, I had this problem too. They found 'dirt' in the aerator/faucet of bathroom faucet, and some in kitchen faucet. When it was cleaned out, the short cycling stopped.
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10-13-2017, 10:36 PM
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#4
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Senior Member
Join Date: May 2014
Location: Alberta - East of the Rockies, West of the Rest
Posts: 1,785
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Could also be tiny pieces of 'crap' in the pump that allow water to flow back into the tank.
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10-13-2017, 10:50 PM
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#5
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Your FILL/CITY valve is basically a 3-way valve. I'm guessing that in the FILL position, the valve is leaking just a little bit back into the FW tank, dropping the pressure. So the pump starts and repressurizes the system and shuts off. A little more water leaks back into the FW tank through the valve and drops the pressure. Then the pump starts and pumps it back up. Repeat.
Could be two causes: 1) It's possible that you didn't have the valve FULLY in the FILL position, allowing the leak-by, or 2) the valve leaks by even in the full FILL position.
(I can fill my FW tank from my AF connection by putting the 3-way valve halfway between the FW position and the AF position.)
When you go back to the CITY position, the valve stops leaking.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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10-14-2017, 12:23 PM
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#6
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ARLO
Join Date: Oct 2008
Location: N Chili, NY
Posts: 908
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Check the fitting on the backside of the pump.
Quote:
Originally Posted by emm-dee
Dry camping at Talladega this week and found an “issue” where the water pump would cycle on/off about 3-4 times a minute. It only stays on for well under a second. All the outlets are shut off and no leakage can be seen.
My water fill system is the single line one where you move a valve between two positions...one to fill the FW tank and the other to use an external water source. When I filled the tank prior to settle up camp I left the valve in the “tank fill” position. When I moved it to external position the cycling stopped.
All is good now but I’m curious about the reason for this to happen.
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10-14-2017, 12:59 PM
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#7
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Senior Member
Join Date: Apr 2017
Location: 8300 Feet - Rocky Mountains
Posts: 2,445
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All good recommendations from previous responders:
1) junk in the lines: every so often I get a small piece of sheet plastic (like a black baggie) stuck in the faucet aerator on my outdoor kitchen. Can't imagine where it's coming from, but that kind of plastic trash could bugger the pump check valve.
2) air in the system: compared to water, air compresses easily....a spongy spring. It's possible that you have air trapped in, for example, the outdoor shower system. Take a moment and make sure you have solid water flow at all valves (sinks, showers, toilet) to minimize any air in the system. The pump can handle a little air, but I know that when I start dry, fill the tank and hot water heater, then turn on the pump, it runs continuously until I draw on at least several of these.
2-a) Be sure your outdoor (and indoor) shower is actually OFF. MANY people use the temp shutoff on the shower head then forget to turn off the hot and cold valves. This will inevitably leak water from the shower head, and because it's outside, you may not notice the leak.
3) pump check valve - or pressure switch - failures: crud in your water (think of your shower head at home) can attach to anything. A particle of calcium or similar would allow the check valve to leak. And ultimately, the sensor for water pressure could be failing or crudded up with junk so it's not sensing properly. Obviously it works, but it may not be working as it should. If you find yourself at this point of the repair effort, you may want to remove the pump and clean it with CLR or similar and examine it carefully. Once you reach this point, if you don't find a definitive answer, you might want to just replace it. Make sure you have a supply of hose clamps to reinstall the pump.
One other test: crack open your hot water heater's high pressure blow off valve and make sure water...not air...comes out. It's unlikely, but an air bubble in the top of the hot water heater would be a soft spring for the pump, and the pump would struggle to maintain pressure enough to trigger the pressure shutoff switch in the pump.
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10-14-2017, 01:01 PM
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#8
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Senior Member
Join Date: May 2017
Posts: 5,712
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Quote:
Originally Posted by babock
More than likely air in the system..
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X2
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10-14-2017, 01:05 PM
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#9
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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Air bubble shouldn't cause this in this kind of time frame. In fact people purposely ADD air bubbles (accumulators) so the pump doesn't run as often; usually done so it won't run at night.
Of course, in the accumulators the air is usually separated from the water. If not, some air can dissolve in the water and lower the pressure;. But this takes a lot more time than what the OP is experiencing. My old well tank had a snifter valve to add air to the tank to replace the air that dissolved, but it took days to dissolve.
Now, if he had a bubble in the HWH and the overpressure valve was leaking, that could cause his problem. But he said it stopped when he moved his fill valve back to CITY.
So air by itself, should not cause rapid cycling of the pump.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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10-14-2017, 06:44 PM
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#10
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Senior Member
Join Date: Jul 2017
Location: California
Posts: 7,616
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Quote:
Originally Posted by rockfordroo
Air bubble shouldn't cause this in this kind of time frame. In fact people purposely ADD air bubbles (accumulators) so the pump doesn't run as often; usually done so it won't run at night.
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I would agree except for the fact that I just read about someone who was able to correct the same problem by bleeding his system, especially the hot water side. Could have been the water heater...I don't remember.
Typically accumulators use air bladders but there are some that do use an air pocket.
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10-14-2017, 07:47 PM
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#11
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Senior Member
Join Date: Jun 2012
Posts: 10,907
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I should have pointed out that water heaters NORMALLY have a small air pocket above the level of the overpressure valve.
See page 19 of the attached.
You need an air pocket BELOW the valve AND a leaky valve to cause the pump to cycle.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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10-14-2017, 09:10 PM
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#12
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Junior Member
Join Date: Dec 2016
Location: USA
Posts: 15
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water pump
simple adjust with allen wrench on the pump itself. I had the same problem.
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10-14-2017, 09:39 PM
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#13
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Multi-Slacker
Join Date: Aug 2017
Location: SoCal
Posts: 2,279
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Don't know if this relevant or not. On our 1st boondock trip the water pump constantly cycled 3 or 4 times per minute (or more). On our Sonoma 280RKS we have no valves that I know of relative to the FW tank. Have to check the external shower just to make sure - we've never used it
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