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07-24-2018, 01:31 PM
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#1
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Junior Member
Join Date: Jul 2018
Location: San Antonio
Posts: 5
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City water fills fresh water tank
When I connect to city water, my fresh water tank fills. I thought this was not supposed to happen. Also sometimes (not always) after showering what I presume to be the fresh water tank overflow drains water for a while. Photo shows unmarked white line that I presume to be the overflow. Perhaps these problems are related. Thoughts? Newbie with Jayco. Thank you!
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07-24-2018, 01:58 PM
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#2
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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Pic?
__________________
2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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07-24-2018, 02:01 PM
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#3
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Site Team
Join Date: Jan 2011
Location: James Island, SC
Posts: 22,852
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What kind of Jayco? Picture of the utility bay if it has one.
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 Moderator
2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
Gator roll-up bed cover
B&W Turnover ball, Companion Std hitch
Can't find what you're looking on JOF? Try Jayco Owners Forum Custom Google Search
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07-24-2018, 02:05 PM
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#4
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Junior Member
Join Date: Jul 2018
Location: San Antonio
Posts: 5
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Photo
2016 White Hawk 27DSRL.
I believe photo is attached.
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07-24-2018, 04:17 PM
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#5
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Junior Member
Join Date: Jun 2017
Location: Milford
Posts: 10
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There are a few reasons this could happen. I'm not familiar with your unit, but some campers have a 3 way valve that redirects city water to the fresh tank. This could be partially open or defective.
Otherwise, there should be a check valve (one way valve) that allows tank water to enter the pump, but not allow city water to enter the tank. If it's leaking or stuck open, then the tank could fill. The check valve is either in the water pump or between the tank and the pump.
edit: Looking into it more, the pump (probably a Shurflo) has a check valve. It's probably defective or there is debris stuck in it. You can try disconnecting the city water and seeing if running the pump clears any debris. Otherwise, if you run the pump, a symptom could be that the pump pressurizes the system and stops, then the water leaks back through the valve and then the pump runs again to re pressurize.
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Davejavu - That weird feeling you've seen Dave before.
2018 Jay Flight 32BHDS
2012 F150 Super Crew - 3.5L EcoBoost
14K Equal-i-zer Hitch
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07-24-2018, 07:53 PM
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#6
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Senior Member
Join Date: Apr 2015
Location: Florissant
Posts: 629
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Quote:
Originally Posted by Davejavu
There are a few reasons this could happen. I'm not familiar with your unit, but some campers have a 3 way valve that redirects city water to the fresh tank. This could be partially open or defective.
Otherwise, there should be a check valve (one way valve) that allows tank water to enter the pump, but not allow city water to enter the tank. If it's leaking or stuck open, then the tank could fill. The check valve is either in the water pump or between the tank and the pump.
edit: Looking into it more, the pump (probably a Shurflo) has a check valve. It's probably defective or there is debris stuck in it. You can try disconnecting the city water and seeing if running the pump clears any debris. Otherwise, if you run the pump, a symptom could be that the pump pressurizes the system and stops, then the water leaks back through the valve and then the pump runs again to re pressurize.
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That seems like a very comprehensive description! 
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Skids
Was 2015 SLX 195RB
Now Bullet 248RKS
2014 Ford F150 3.5L Ecoboost
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07-24-2018, 08:05 PM
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#7
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Junior Member
Join Date: Jul 2018
Location: San Antonio
Posts: 5
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Very helpful
Very good detail on the problem. As you suggested, the pump is a Shurflo. It is easily accessible. I’ll try running it to see if that clears it. If not I’ll see if I can disassemble and clean the valve. Thank you!
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07-24-2018, 08:13 PM
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#8
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Senior Member
Join Date: Mar 2015
Location: State of Confusion
Posts: 5,013
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One last item:
Check your water hose and see if the washer/screen is in backwards. It should be hump side out. We had one in backwards that kept the check valve open.
Murff
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Murff
2015 White Hawk 20MRB (It's last year)
2017 F150 2.7 Eco Boost 3.73 Gears
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07-24-2018, 08:15 PM
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#9
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Junior Member
Join Date: Jul 2018
Location: San Antonio
Posts: 5
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Interesting
Interesting. I’ll check it tomorrow. Thanks!
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07-26-2018, 04:00 PM
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#10
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Junior Member
Join Date: Jul 2018
Location: San Antonio
Posts: 5
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Problem solved (hopefully)
I checked the screens and all seems OK. Focusing on the check valve in the water pump, I cycled water pump pressure - bleed down - city pressure - bleed down six times hoping that if the check valve was stuck or dirty that would free it up. Bleed down was bleeding down water pressure inside the tt. I then put full city pressure on for four hours with no water build up in the fresh water tank noted. I think that the problem was the check valve, it is now working as it should, and hopefully the problem is solved. Thanks all for the thoughts and help!
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