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11-14-2017, 02:57 PM
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#1
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Junior Member
Tiffin Owners Club
Join Date: Apr 2017
Posts: 16
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Water Pump Cycling
I have an 2011 Allegro Bus 43 that is all electric. When I disconnected the water supply to run off the water tank and I turned on the water pump. As I would use the water I noticed the sound of the water pump and it would come on then cut off, the volume of water would increase with the pump on and decrease when it turned off. I can't figure out why as it is doing this several times over a 30 second span. Is there something closed or partially closed? Any help would be greatly appreciated.
Thanks
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2011 Tiffin Allegro Bus 43 QRP
Cummins 8.9, Mileage 24,850.
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11-14-2017, 07:51 PM
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#2
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,019
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likely a leak somewhere. look at ground, back of water heater, in/under the wet bay...
if you have just serviced water heater, trapped air could also lead to this.
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Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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11-15-2017, 08:15 AM
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#3
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,578
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!
Sorry I can't help, haven't had that problem! Keep her between the ditches!
Good luck, happy trails, and God bless!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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11-15-2017, 09:53 AM
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#4
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Junior Member
Tiffin Owners Club
Join Date: Apr 2017
Posts: 16
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Quote:
Originally Posted by CountryFit
likely a leak somewhere. look at ground, back of water heater, in/under the wet bay...
if you have just serviced water heater, trapped air could also lead to this.
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Thanks CountryFit but
I have Aqua Hot so no electric or gas water heater. Also no water on the ground or wet bay.
__________________
2011 Tiffin Allegro Bus 43 QRP
Cummins 8.9, Mileage 24,850.
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11-15-2017, 10:07 AM
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#5
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Senior Member
Join Date: Jul 2012
Location: SoCal
Posts: 689
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The diaphragm within the water pump may have developed a tear. This will result in a loss of pressure and cycling.
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Fred & Mary RVM135
2012 Dutch Star 3735 ISL 400
2012 GMC Sierra Ext Cab 4x4
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11-15-2017, 10:09 AM
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#6
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Senior Member
Join Date: Jan 2015
Location: Oroville, CA
Posts: 3,133
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Sounds normal to me, you are using less water than pump capacity so the pump cycles on and off while in use. Turn on more faucets, and the pump will likely run the whole time. Leaks can be detected by the pump running when all faucets are off. You will hear the pump run for a fraction of a second or so with all fixtures off or closed. When that happens you have a leak.
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Bill, Kathi and Zorro; '05 Beaver Patriot Thunder
2012 Sunnybrook Harmony 21FBS (SQEZINN)
2007 Jeep Grand Cherokee Overland
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11-15-2017, 10:09 AM
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#7
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,305
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Quote:
Originally Posted by 4Bill
I have an 2011 Allegro Bus 43 that is all electric. When I disconnected the water supply to run off the water tank and I turned on the water pump. As I would use the water I noticed the sound of the water pump and it would come on then cut off, the volume of water would increase with the pump on and decrease when it turned off. I can't figure out why as it is doing this several times over a 30 second span. Is there something closed or partially closed? Any help would be greatly appreciated.
Thanks
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That is normal. The pump can put out more water than your tap let's out. So it cycles to maintain the cut-in and cut-out pressure range.
Happy Glamping.
__________________
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!
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11-15-2017, 10:16 AM
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#8
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Senior Member
Join Date: Jan 2015
Location: Oroville, CA
Posts: 3,133
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If your pump is a SurFlo, you can adj the pressure by turning the small screw in the middle of the pump head in, try 1/4 turn and test again. Might help with your cycling.
__________________
Bill, Kathi and Zorro; '05 Beaver Patriot Thunder
2012 Sunnybrook Harmony 21FBS (SQEZINN)
2007 Jeep Grand Cherokee Overland
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11-15-2017, 10:25 AM
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#9
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Senior Member
Join Date: Jun 2017
Posts: 2,807
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Quote:
Originally Posted by cruzbill
Sounds normal to me, you are using less water than pump capacity so the pump cycles on and off while in use. Turn on more faucets, and the pump will likely run the whole time. Leaks can be detected by the pump running when all faucets are off. You will hear the pump run for a fraction of a second or so with all fixtures off or closed. When that happens you have a leak.
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Finally! Someone who read and understood the OP.
You can also reduce the cycling time by installing an expansion tank like this:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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11-15-2017, 11:31 AM
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#10
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Senior Member
Winnebago Owners Club
Join Date: Mar 2016
Location: Stone Mountain, Ga
Posts: 282
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In the same note of opening faucets, provided your faucets have screens on the end. Close drain first and then unscrew faucet caps, remove screens and aerators, stick a pinky into faucet to makes sure there is not another screen, turn water on slowly to flush, clean and replace parts. An obstruction will reduce flow as well.
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Anthony & DW
2001 Ultimate Freedom
Cummins 350 ISC, Spartan MM GT Chasis
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11-18-2017, 05:50 PM
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#11
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Senior Member
Join Date: Jun 2017
Location: Worcester Pennsylvania
Posts: 1,063
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Quote:
Originally Posted by tfryman
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Read my mind, expansion tank would give real consistent flow. A water pressure regulator after the tank would give perfect pressure every time. The expansion tank would take all the ups & downs.
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2006 Fleetwood Bounder 35E Trek pure Trike, electric, 50 mile range, 7000 ,miles the get everything runner. To be toad list Done, Ford E450 toad. Stay & Play active brakes.
Full-time since 2018. LG 4.5 cu ft washer/dryer.
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11-18-2017, 11:04 PM
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#12
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,019
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mine does not have an expansion tank, and the pump does not keep cycling. op needs to find out the real cause, possibly a leak somewhere.
__________________
Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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11-19-2017, 12:33 AM
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#13
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,305
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It's a flow issue. Pump can flow more than is coming out of the tap.
Happy Glamping.
__________________
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!
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11-20-2017, 06:10 AM
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#14
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Senior Member
Join Date: Jun 2017
Posts: 2,807
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Quote:
Originally Posted by CountryFit
mine does not have an expansion tank, and the pump does not keep cycling. op needs to find out the real cause, possibly a leak somewhere.
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If the pump was cycling when all water was turned off you would be right, but in this case, the pump is cycling when he has water turned on; which means the pump is putting out more than the faucet will allow to flow, so the pump cycles off as it reaches its high pressure cut out, and cycles back on when the pressure drops again because of the water flowing out of the faucet.
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