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04-10-2015, 09:23 PM
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#1
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Junior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2014
Posts: 8
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Water going into fresh water tank
Has anyone had a problem with water going into fresh water tank when the filler valve in closed? I am hocked up to outside water and it seems to be leaking into my fresh water tank, had a repair man out here today to replace the filler valve and it's still filling up my tank. Please help
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04-10-2015, 09:46 PM
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#2
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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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Quote:
Originally Posted by spank
Has anyone had a problem with water going into fresh water tank when the filler valve in closed? I am hocked up to outside water and it seems to be leaking into my fresh water tank, had a repair man out here today to replace the filler valve and it's still filling up my tank. Please help
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I'm having an intermittent fresh water valve leak that can fill my tank up. I will need to replace my valve in the near future. I would have thought a replacement valve would solve your problem unless it was faulty. I would think the repairman's work is warranted so I would go back to them to figure it out.
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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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04-11-2015, 02:57 AM
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#3
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Senior Member
Join Date: Sep 2012
Location: Tasmania now, USA/Canada/Alaska in April
Posts: 2,473
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Backflow through the pump?
__________________
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
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04-11-2015, 05:14 AM
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#4
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Member
Join Date: Jun 2014
Location: Owosso, MI
Posts: 34
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My City water hook-up was filling my fresh tank. I"m not sure why, I don't see anything in the water bay that I can shut that off with. I do need to figure it out this spring
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2000 Damon Intruder 351
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04-11-2015, 05:59 AM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
Posts: 1,482
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The check valve in the water pump is failing. On mine I put a separate check valve in the line from the pump.
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04-11-2015, 06:00 AM
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#6
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,889
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All of the RV's I have experience with seems to use this basic water layout. The one shown below is one I drew for a 97 Fleetwood Discovery. As you can see, there are two ways water can enter the water tank. One is through the city/tank fill valve and the other way is through the water pump if the one way valve becomes defective.
So if you have changed the city/tank valve I would look to the water pump one way valve. Could be a small speck of dirt keeping the valve from working properly.
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Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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04-11-2015, 07:31 AM
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#7
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Senior Member
Tiffin Owners Club Winnebago Owners Club
Join Date: Feb 2012
Location: Las Cruces, NM
Posts: 4,040
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There are three ways to fix this: 1) rebuild the pump; 2) replace the pump; or 3) add a check valve or shut off valve between the pump and the water tank.
You can also help prevent this by never turning on the water pump when connected to city water. If you find this happening while on a trip, you can sometimes fix the problem by turn off the city water and pump and opening a faucet to depressurize the system. Making sure the pump is still off, slowly open the city water valve and repressurize.
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Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)
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04-12-2015, 08:04 PM
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#8
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Senior Member
Winnebago Owners Club
Join Date: May 2008
Location: Surprise, AZ
Posts: 816
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Quote:
Originally Posted by spank
Has anyone had a problem with water going into fresh water tank when the filler valve in closed? I am hocked up to outside water and it seems to be leaking into my fresh water tank, had a repair man out here today to replace the filler valve and it's still filling up my tank. Please help
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I had the same issue. In my case it was the city water/tank fill valve. It was not closing completely and this was causing water to seep into the onboard fresh water tank when I was hooked up to city water.
Good luck!
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04-13-2015, 03:07 AM
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#9
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Senior Member
Join Date: Sep 2012
Location: Tasmania now, USA/Canada/Alaska in April
Posts: 2,473
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Normally, you can usually check if it is the pump allowing back feeding.
Turn off city water, turn on pump (with water in the tank of course) and make sure pump is supplying water to the MH by turning on hot and cold faucets.
Turn off faucets. Pump should stop within a few seconds.
Pump should remain off.
If pump is cycling on for a second or so and then off for a lot longer, then it is possible there is back flow back through the pump.
Trouble is, if the tank fill valve is leaking (despite being a new one), this will give exactly the same symptoms, but if you are certain the new fill valve is good, then this test should confirm the condition of the pump.
If the pump problem is due to debris caught under a valve seat, then running the pump with town water disconnected and cycling the pump using the faucets turned on and off rapidly and fully, may flush the debris out
To check the pump fully is still fairly simple. With pump off and town water connected, disconnect the hose on the suction side of the pump and see if water continues to flow back out of the pump inlet port. If it does, then the pump is the problem
__________________
Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
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04-13-2015, 10:38 AM
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#10
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Senior Member
Monaco Owners Club Holiday Rambler Owners Club
Join Date: Feb 2010
Location: Buffalo, NY
Posts: 1,632
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Quote:
Originally Posted by Tony Lee
To check the pump fully is still fairly simple. With pump off and town water connected, disconnect the hose on the suction side of the pump and see if water continues to flow back out of the pump inlet port. If it does, then the pump is the problem
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Before doing this, make sure to close the valve from the fresh water tank that supplies the pump. And instead of removing the suction side hose, many pumps have a strainer screen with a clear cap -- removing this will accomplish the same thing.
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Adam and Sue, and a pack of little furballs
2007 Holiday Rambler Endeavor 40PDQ Limited Edition - Cummins ISL 400
2013 Ford F-150 FX4 toad - USGear Unified Tow Brake, Roadmaster Blackhawk II Tow bar, Blue Ox baseplate
Home base near Buffalo NY, often on the road to a dog show
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04-13-2015, 10:47 AM
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#11
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Senior Member
Ford Super Duty Owner
Join Date: May 2010
Location: Pensacola Fl
Posts: 667
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Make sure the fill selector valve is ALL THE WAY to its stop, don't just use the decal stop position line...go past it till you feel it stopped.
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04-13-2015, 12:58 PM
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#12
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Senior Member
Fleetwood Owners Club
Join Date: Dec 2011
Location: Willow Lakes RV & Golf Resort, FL
Posts: 3,163
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Quote:
Originally Posted by Rossi6998
I had the same issue. In my case it was the city water/tank fill valve. It was not closing completely and this was causing water to seep into the onboard fresh water tank when I was hooked up to city water.
Good luck!
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Same hear. Actually had two defective by pass valves. The tiniest leak will bleed into your FWT.
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Clay & Pebble
2012 Providence 42 M. Spartan Chassis, 450 ISL
Ford Edge toad, RM All Terrane, TST TPMS, SMI Air Force One, RVM95....
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04-15-2015, 10:01 PM
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#13
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Senior Member
Monaco Owners Club
Join Date: Aug 2011
Location: Wherever we are
Posts: 389
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Quote:
Originally Posted by Rossi6998
I had the same issue. In my case it was the city water/tank fill valve. It was not closing completely and this was causing water to seep into the onboard fresh water tank when I was hooked up to city water.
Good luck!
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That was my problem, too. The selector valve apparently picked up a little piece of grit that prevented it from closing completely. I worked the valve full cycle 15-20 times and that seems to have cleared the obstruction, because the problem has not reoccurred in several months.
Cheers,
__________________
Bob Covey
Home: 2003 Monaco Executive 43 SDDS, ISM
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