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02-24-2017, 03:21 AM
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#1
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Senior Veteran RV Owner
Join Date: Feb 2017
Location: Brandon, Florida
Posts: 120
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Filling Fresh Water Tank - Water drains out
I own a 2015 GT 328ts. Every time I fill the fresh water tank to full, water drains out through a pipe under the kitchen slide and my fresh water tank is now near empty. My pump is off and I cannot stop the water from draining out. If I only fill the tank to about 1/2 full, it doesn't drain out. What is going on with this water draining out?
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Art Mullis
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02-24-2017, 03:55 AM
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#2
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Just a member
Join Date: Jul 2011
Location: Great White North
Posts: 921
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K&L + the Wild Bunch
TT: 2011 Rockwood 8293RKSS
TV: 2019 Dodge 3500 SRW Crew HO CTD
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02-24-2017, 07:18 AM
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#3
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Senior Member
Join Date: Oct 2016
Location: Pharr Texas
Posts: 337
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You are probable over filling it. The water starts draining out the over flow and sets up a siphon effect. Try Feelin It three quarters or 90% full and stopping see if that solves the problem.
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Jim & Pat
2016 Georgetown XL - 369DS
Tow Chevy Equinox
Blue ox and Brake buddy
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02-24-2017, 08:46 AM
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#4
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Senior Member
Join Date: Dec 2012
Posts: 7,640
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That pipe is the vent for the holding tank. It will let you know when the tank is full. Yes, there will be a syphoning effect created and it will continue till the water level drops below the vent tube insert level. This issue is common and a plethora of inputs can be read if you do a FRF search for the issue. I was able to just make a vertical loop in my tubing and that allowed me to completely fill the tank with no syphoning but there are other ideas if you do the search.
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02-24-2017, 08:51 AM
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#5
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,505
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Lots of threads on this. Common fix is to put a cap or valve on the end of the vent tube. Then just fill until water starts coming out the vent and close the valve. After a couple of showers you can open the valve.
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Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder
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02-24-2017, 08:56 AM
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#6
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,051
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Yep... usually all caused by the routing (or lack) of the vent tube.
You will need to look at how it was routed and reposition or replace.
Also, many have simply put a 1/4 turn valve in the line.
If you do, just make sure you open it when filling or once you start drawing water from the tank.
It's a vent for a reason.
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=64
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02-24-2017, 01:00 PM
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#7
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Member
Join Date: Mar 2016
Location: Jacksonville, FL
Posts: 48
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Forget warranty to fix
Quote:
Originally Posted by amullis
I own a 2015 GT 328ts. Every time I fill the fresh water tank to full, water drains out through a pipe under the kitchen slide and my fresh water tank is now near empty. My pump is off and I cannot stop the water from draining out. If I only fill the tank to about 1/2 full, it doesn't drain out. What is going on with this water draining out?
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Had same problem. Took to dealer was told "oh you shouldn't travel with water. Fill up when you get where u are going". Called factory warranty department told same thing. Best you can do is put valve on end of vent hose.
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02-24-2017, 01:17 PM
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#8
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Senior Member
Join Date: Dec 2014
Location: Missouri
Posts: 441
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Quote:
Originally Posted by AJAbbott
Had same problem. Took to dealer was told "oh you shouldn't travel with water. Fill up when you get where u are going". Called factory warranty department told same thing. Best you can do is put valve on end of vent hose.
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Agree. We haven't installed a valve, but we don't fill the tank before travel either - just enough to use the toilet. Besides, a full tank can put extra weight on the supports that hold the tank in place, and that's another topic in itself!
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02-24-2017, 01:22 PM
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#9
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Senior Member
Join Date: Jul 2010
Posts: 7,948
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Quote:
Originally Posted by gfarmcafe
Agree. We haven't installed a valve, but we don't fill the tank before travel either - just enough to use the toilet. Besides, a full tank can put extra weight on the supports that hold the tank in place, and that's another topic in itself!
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X2
I only fill about 1/4 of a tank for toilet flushing while driving to next campground. I have never filled my tank up full as we do not dry camp for any extended period of time.
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02-24-2017, 02:23 PM
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#10
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Senior Member
Join Date: Apr 2014
Location: West Atlanta Metro
Posts: 1,235
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I would suggest a valve with a float ball in it so when you fill the tank it will shut off the vent when it is full then when you start using water from the tank it will drop back open. If you put a valve on the tank that seals it off you will collapse the tank if you forget to open it back up again.
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2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23 Camped 2015-47
Camped 2016-71, 2017-33, 2018-29 booked
KT4W
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02-24-2017, 02:31 PM
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#11
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Senior Member
Join Date: Sep 2016
Location: SE Michigan
Posts: 2,024
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Pretty poor when you cannot fill a FW tank for fear of it dropping in the road.... Don't say much for quality construction.
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02-24-2017, 02:37 PM
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#12
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Senior Member
Join Date: Dec 2016
Location: Virginia`s Eastern Shore
Posts: 283
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Quote:
Originally Posted by SidecarFlip
Pretty poor when you cannot fill a FW tank for fear of it dropping in the road.... Don't say much for quality construction.
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2017 Coachmen Catalina 283RKS
2004 Chevy Silverado 2500HD Crew Cab
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02-24-2017, 02:41 PM
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#13
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Senior Member
Join Date: Apr 2014
Location: West Atlanta Metro
Posts: 1,235
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That's about 417# bouncing up and down.
__________________
2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23 Camped 2015-47
Camped 2016-71, 2017-33, 2018-29 booked
KT4W
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02-24-2017, 02:57 PM
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#14
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Member
Join Date: Nov 2016
Posts: 71
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same
had same problem with my 2017 model. Took it to dealer and they put a valve
at the end of drain hose. Your water is being siphoned out. So with that valve on I open it when filling, until water runs out, showing tank is full. Then close the valve to keep it from siphoning out.
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02-24-2017, 03:27 PM
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#15
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Senior Member
Join Date: Sep 2016
Location: SE Michigan
Posts: 2,024
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Quote:
Originally Posted by BooBoo23
That's about 417# bouncing up and down.
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Sounds to me like the up is no issue but the down is a BIG issue.
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02-24-2017, 05:06 PM
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#16
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,505
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If I couldn't haul a full tank of water down the road, I'd be getting a different rig.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder
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02-24-2017, 05:30 PM
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#17
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Senior Member
Join Date: Sep 2016
Location: SE Michigan
Posts: 2,024
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Quote:
Originally Posted by NMWildcat
If I couldn't haul a full tank of water down the road, I'd be getting a different rig.
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I'm with you on that. I primitive camp anyway so a full FW tank is mandatory, ain't no water (potable) where I camp at...
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02-24-2017, 05:41 PM
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#18
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Member
Join Date: Nov 2016
Posts: 45
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When mine starts to siphon, I blow back in the vent tube and break the siphon. Yes, just blow into the tube and you will know if you have broken the siphon action because no more water comes out. No valve to forget to open if this works for you.
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Bruce
2015 XLR Thunderbolt 415 AMP
2016 RAM 3500 6.7L DRW
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02-24-2017, 06:09 PM
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#19
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Senior Member
Join Date: Jun 2013
Posts: 657
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The water pump check valve remains open and allows the siphon to continue. Here is the procedure I used and seemed to work for e. Has not happened to me again:
Turn off water pump if on.
Turn on any faucet wait 1 min
Turn on water pump
let water run 1 min
Turn off faucet
turn off water pump
Wait for water pump to quit running
Turn on city water
This reseats the check valve in the water pump. Do not run the water pump when connected to city water.
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2014 Georgetown 378 XL
Toyota Prius on dolly.
Full time since 2014
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02-24-2017, 07:21 PM
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#20
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Member
Join Date: Jun 2016
Posts: 83
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If you will shut the FILL VALVE after the tank is full it will stop the siphon.
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