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11-01-2018, 10:03 AM
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#1
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Senior Member
Join Date: Mar 2017
Location: Sarasota
Posts: 742
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Fresh water tank magically fills itself.....
I'm seeing an odd phenomenon on our 19XUD.
The City Water connection is hooked up, so I'm not using the fresh tank.
Over a couple of days, the fresh tank is mysteriously filling itself.... I can drain it and, a couple of days later, it's 2/3 or more full again.
My best guesses are:
a) There's an unadvertised cross connection between the two, with maybe an isolator valve that's not fully closed, or leaking slightly.
b) There's a non-return valve, maybe on the water pump, which is faulty and allowing a slight backflow from the faucet side into the fresh tank.
c) Same as b, but backflow from the water heater.
d) There are little elves with tiny buckets, slowly filling up my tank at night, while I sleep.
Jayco's manual is predictably unhelpful... it doesn't mention anything about getting rid of troublesome elves, for instance... and it specifically says that the fresh tank cannot be filled from the city connection.
So I'm wondering if anyone has had the same issue...and, more importantly, fixed it?
Alternatively, does anyone have a reliable plumbing diagram for a 2017 19XUD, please?
As far as I can tell, access to the pump/valve area, requires dismantling one of the bench seats (there's a little "trapdoor" in the seat, but it's not much help.)
Any help, clues, guidance, would be most appreciated.
__________________
IanP, the man from Scotland
Julie, the Lady From Little Rock
Jay Feather 19XUD, pushing a Jeep Grand Cherokee
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11-01-2018, 10:10 AM
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#2
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Senior Member
Join Date: Apr 2018
Location: Little Rock
Posts: 120
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I cant help, but on my 2017 19XUD, the whole plywood bench seat (including the trap door) lifts up to reveal all plumbing connections. Sounds like cross connection or bad (or not totally closed) valve. Let us know what you find out.
__________________
2017 Jay Feather 19XUD
2012 F-150 3.5L
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11-01-2018, 10:18 AM
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#3
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Senior Member
Join Date: Oct 2017
Location: Calgary
Posts: 458
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Leaky valve is my guess, but I'm hoping it's elves. That would be awesome.
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11-01-2018, 10:20 AM
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#4
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Site Team
Join Date: Nov 2012
Location: Clearwater, FL area
Posts: 5,196
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I am not totally sure, but there is either a one way valve between the fresh water pump and the hook up to the TT plumbing, or the water pump has an internal one way valve. I am sure, but one of the more plumbing technical members will help out here.
You may be able to check if that is your problem by opening the valve by the water pump that has a hose on it for filling the TT plumbing system with antifreeze for winter. If you open the hose valve and close the valve going to the freshwater tank and you have the city water connected, the water will come out the hose, if the one way valve is defective or if there is none.
I am sure one of the members will verify this for me.
Don
My Registry
RVing with SOLAR
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11-01-2018, 10:34 AM
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#5
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Senior Member
Join Date: Jun 2017
Location: johnstown
Posts: 321
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D is the only answer !
If you contact jayco they will send you plumbing schematics. I would guess it's a check valve in the pump.
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11-01-2018, 12:24 PM
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#6
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Senior Member
Join Date: Dec 2015
Location: Arizona
Posts: 2,324
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X2 on the manual who ever wrote it, must have never owned a camper lol!
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11-01-2018, 12:41 PM
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#7
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Senior Member
Join Date: May 2015
Location: Charles Town
Posts: 469
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On my Jayflight 23rb the water pump had a back flow preventer that stuck and let the fresh water tanks fill off city water. Clean it, whack it, or replace it, whatever works!
__________________
2014 Toyota TundraTRD double cab 4x4 tow package off road package 46 gallon fuel tank
2018 Jayco White Hawk 23MRB solar equipped
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11-01-2018, 01:00 PM
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#8
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Senior Member
Join Date: Nov 2011
Location: Where ever the boss says we're going.
Posts: 15,952
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Quote:
Originally Posted by Racinforthefinish
On my Jayflight 23rb the water pump had a back flow preventer that stuck and let the fresh water tanks fill off city water. Clean it, whack it, or replace it, whatever works!
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Usually the problem.. Running the pump before you drain the tank may also help.
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11-09-2018, 01:13 PM
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#9
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Senior Member
Join Date: Dec 2010
Location: Wheatfield, New York
Posts: 1,069
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Close the valve between the pump and the fresh water tank. If that solves the problem, you'll know it's the check valve in the pump. As a workaround you could simply leave the valve closed 'till you get a chance to rebuild/replace the pump.
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2009 Jayco Jay Feather 17C 130W Solar, 2021 F150 2.7L Eco Boost, 2021 Toyota Highlander
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11-09-2018, 01:36 PM
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#10
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Senior Member
Join Date: Sep 2017
Location: Edgewater
Posts: 390
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I took a slightly different approach to this. I added a real check valve between the pump and the tank. Don't know for sure but it seems to be working fine.
__________________
Jim Davis
2018 Hummingbird 17RK
Toyota Highlander
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11-09-2018, 04:34 PM
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#11
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Senior Member
Join Date: Dec 2010
Location: Wheatfield, New York
Posts: 1,069
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Quote:
Originally Posted by Jim Davis
I took a slightly different approach to this. I added a real check valve between the pump and the tank. Don't know for sure but it seems to be working fine.
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Good idea. But I was just thinking...if the OP's check valve was bad, the pump would keep cycling trying to keep the pressure up; did yours do that?
Or maybe he never uses his pump?
__________________
2009 Jayco Jay Feather 17C 130W Solar, 2021 F150 2.7L Eco Boost, 2021 Toyota Highlander
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11-09-2018, 05:13 PM
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#12
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Senior Member
Join Date: Sep 2017
Location: Edgewater
Posts: 390
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My pump seems to be fine but on a recent trip my tank filled while I was on city water. I disconnected and just used the pump and tank. I considered trying to find out what needed to be done and took the easy way out by putting a plumbing check valve in the line. I did put a one inch block under the pump to get the check valve more vertical.
__________________
Jim Davis
2018 Hummingbird 17RK
Toyota Highlander
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11-11-2018, 04:46 PM
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#13
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Senior Member
Join Date: Aug 2015
Location: Ottawa, ON
Posts: 1,954
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Quote:
Originally Posted by Isaacs
Good idea. But I was just thinking...if the OP's check valve was bad, the pump would keep cycling trying to keep the pressure up; did yours do that?
Or maybe he never uses his pump?
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The pump wouldn't need to be on because it is on city water. The system is pressurized.
My concern with adding a check valve on the back side of the pump is ensuring that you are using pressure rated pex pipe or similar between the valve and the pump. If the valve inside the pump is leaking, the hose back to the new check valve will start to pressurize. If you just used the clear poly pipe that they tend to put on the siphon (non-pressure) side of the pump, it may burst once it starts to pressurize.
__________________
2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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11-11-2018, 05:27 PM
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#14
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Senior Member
Join Date: Sep 2017
Location: Edgewater
Posts: 390
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My check valve is in PEX, not vinyl. I still haven't had the chance to check it totally, but it was good on a dry camping trip.
__________________
Jim Davis
2018 Hummingbird 17RK
Toyota Highlander
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11-17-2018, 04:33 PM
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#15
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Senior Member
Join Date: Apr 2018
Location: Depew
Posts: 195
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My new in May 2018 jayco 322rlok is doing the same thing, i will be taking it in for some warranty work and this is on the list.
I will share what they say it is after I get it back in Mid December
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11-17-2018, 06:03 PM
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#16
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Site Team
Join Date: Jan 2011
Location: James Island, SC
Posts: 22,772
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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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11-17-2018, 08:03 PM
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#17
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Senior Member
Join Date: Apr 2017
Location: NW Wisconsin
Posts: 128
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Have to agree with the thread referenced by norty1. Our 2018 28.5RSTS did the same thing, found the tank to be mysteriously full . I believed that I had inadvertently bumped the pump on possibly more than once, while hooking up to city water. Without being under pressure, the pump check valve was not fully closed. In subsequent hookups ran a bit of water from the fresh tank with the pump, shut it off, then hooked up the city water. Hasn't happened again. I may not completely understand the plumbing hookup.. but in the next half dozen stays, it didn't do it again.
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11-18-2018, 12:46 PM
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#18
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Member
Join Date: Jul 2017
Location: Prudenville
Posts: 33
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My first coach was a pace arrow and I had same problem. It was water pump. Replaced and no more fresh water tank over flow. This was 11 years ago, I was newbie and can't remember why.
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