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05-08-2015, 05:54 AM
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#1
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Member
Join Date: Feb 2012
Posts: 64
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Fresh water tank overfills
I noticed today that the fresh water tank overflow outlet had water running out of it. I am connected to city water and I have verified the valve is NOT in the fill position. I shut off the city water supply, turned on the pump and drained down the tank level to where the overflow stopped. I rotated the fill/city water valve several times to each extreme stop. It appears to be working fine. I again placed the valve in the off position and turned on the city water at the spigot. Shortly thereafter the tank was overflowing again.
Can these valves fail? As a side note, I did rotate the valve handle to the fill position while the city water supply was on and you could hear and feel the water flowing at capacity to the water tank. Rotating the valve to the off position you could hear the water stop flowing. That tells me it is working? Right?
I searched the threads but didn't find this particular problem. I am hoping someone might have had the same issue and can share the fix.
Thanks in advance.
HoboBob
2007 DS 4304
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HoboBob
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05-08-2015, 06:34 AM
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#2
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: Sep 2012
Location: Miramar Beach, Florida
Posts: 865
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Yes these valves can fail. It sounds like your valve is "leaking by" which means a very small amount of water is passing past the valve even though the valve is in the closed position.
I am confident the only way water gets into the tank is through the fill valve. Again, they can and do go bad after years of service.
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Ken & Diane
2014 Newmar Ventana 4369 All Electric 400HP
2023 Jeep Grand Cherokee Overland
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05-08-2015, 06:38 AM
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#3
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Senior Member
Newmar Owners Club Freightliner Owners Club Spartan Chassis
Join Date: Apr 2012
Location: ON THE ROAD...SOMEWHERE
Posts: 6,973
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Try disconnecting from city water then turning on the water pump. If the jump cycles on and off it could be the pump. I just went through a similar situation and that was my problem.
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Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 2015 DSDP 4320 4369, FL Chassis, 2013 CR-V 2020 Jeep Overland, Blue Ox Avail, SMI AF1.
[SIGPIC][/SIGPIC]
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05-08-2015, 06:50 AM
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#4
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Senior Member
Join Date: Mar 2009
Location: Apollo Beach & Key West , FL
Posts: 3,837
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Does your valve have a plastic handle on it ? On my unit, the inside of the plastic handle rounded off and it didn't fully close the valve. Temp solution was to take off the handle and turn with a wrench. Since Newmar no longer uses the plastic handle, the long term solution was to put on a metal handle
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05-08-2015, 07:47 AM
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#5
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Member
Join Date: Feb 2012
Posts: 64
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Thanks for the tips. The flow out the overflow is pretty steady. A lot more than a small leak past the valve. I will look at the handle closer. The pump does not cycle unless a tap is opened.
Not sure if related but I don't use a regulator and the water pressure at this park and the last one is and was very high. I am going to pick one up today. I know......closing the barn door after the horse got out.
HoboBob
2007 DS 4304
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HoboBob
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05-08-2015, 07:55 AM
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#6
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Senior Member
Join Date: Oct 2012
Posts: 2,328
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My guess: the pump check valve might be leaking allowing city water to back flow into the tank.
I am not sure where the check valve is located on your system so I can't tell you how to check it.
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Paul, Kathy, and Tux the Mini Schnauzer
2014 Tiffin Phaeton 42 LH, 2013 Honda CRV
"When the time comes to look back, make sure you'll like what you see"
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05-08-2015, 07:57 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Jul 2008
Posts: 157
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Hello - water can back flow through the water pump. The water pump has a backflow valve built into it that can fail (this happened to me and the water tank levels would go up when on city water).
If you have a shut off valve in front of the water pump, you can shut it off while on city water to test if this is what is happening in your case.
Alan
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05-08-2015, 08:07 AM
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#8
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Senior Member
Join Date: Feb 2012
Posts: 1,138
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My bypass ball valve does not completely close and I get water running into the tank during the city water use. If the water tank is close to full.. I will get hissing and spitting and eventually a nice stream coming out the overflow on the water fill area.
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Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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05-08-2015, 09:58 AM
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#9
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Member
Join Date: Feb 2012
Posts: 64
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Well, I had to drill the rusted screw to get the handle off the valve. Valve leaks a bit. But I can turn it off and on with vice grips. Feels sloppy. I still hear a little water running when the valve is turned to the off position. I don't see a valve to isolate the water pump to eliminate that from the list of possibilities. So still not sure if it is the valve or water pump back flowing.
Unfortunately, Camping World can't tell me what replacement valve I need until they see it. Anyone know the model of the valve Newmar used on a 07 DS?
Also to access it, I will need to remove the whole panel, which involves cutting all the shark bite connections and finding replacements. Now I see what others mean when they say it is a PITA to access anything behind the panel.
If I have to tear it all out, I will probably just replace the pump as well since I don't know if this is the original or not.
HoboBob
2007 DS 4304
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HoboBob
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05-08-2015, 10:11 AM
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#10
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,439
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JMHO: Spend the extra $$ and get the adjustable , water pressure regulator with a pressure gauge. With the less expensive reducers , you're never sure what your getting.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-08-2015, 10:15 AM
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#11
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Member
Join Date: Feb 2012
Posts: 64
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That's what I was thinking as well, Skip.
HoboBob
2007 DS 4304
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HoboBob
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05-08-2015, 01:53 PM
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#12
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Member
Join Date: Feb 2012
Posts: 64
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Looks like the winners are............bad water pump! Installed a new water pump (old one is the original). No more slight water running noise with the valve in the city water position. So I will let it set a few hours to see if the water tank overflows but I think I got it, with everyone's help.
Never realized just how dang loud the old pump was. The new ShurFlo is super quiet. I will have to make sure to check the switches now. I was use to hearing it run to remind me it was on.
I will have to see about getting a replacement fill/city water valve and handle from Newmar. Hope they have one. But can do it after this trip. Will just have to use pliers to work the valve in the interim.
Thanks to you all for your suggestion and ideas. I love IRV2. What a wealth of information and support.
HoboBob
2007 DS 4304
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HoboBob
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05-08-2015, 01:59 PM
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#13
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Junior Member
Join Date: Oct 2013
Posts: 15
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I had the same problem with the water fill valve leaking, and over filling the fresh water tank. It looked like it was going to be a huge PITA to take the whole board off to replace the valve. Instead, I just reached behind the board and put a good brass shut off valve in line between the old valve and the tank fill. Now I can just leave the valve on the board open, and then reach behind the board to open or close the new in line valve. I should label it somehow to make it easier for the next guy.
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Eric and Sandi
2006 Mountain Aire 4309
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05-08-2015, 03:35 PM
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#14
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Member
Join Date: Feb 2012
Posts: 64
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Fresh water tank overfills
Oh, forgot to add I purchased a Watts adj. water pressure regulated and put in-line with the hose. Nice unit but a little spendy.
State Trailer Supply in Salt Lake City has great people to help you and an unbelievable parts supply. Check em out on-line. Everything you need for any project.
HoboBob
2007 DS 4304
__________________
HoboBob
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