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07-22-2018, 12:47 PM
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#1
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Registered User
Join Date: Jul 2017
Location: Cincinnati, OH
Posts: 34
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Fresh water tank losing 1/3-1/2 volume after drive to site
I'll start with my question. Inquiring minds can read more below:
Is it normal to lose 1/4-1/2 of your fresh water tank while pulling TT down the highway for 8-12 hours? Trailer is brand new 2019 GD 297RSTS with 3 total trips on it. Trailer has drain hose on tank for overflow to notify when full during fill up.
Prior to going into Cache la Poudre River mountain park campsite, I needed to fill fresh water tank since no fresh water was available at campground. I filled to full, both per monitor and overflow drain hose at overnight stop in Nebraska. Than after an 8 hour drive of 480 miles or so, I had half a tank at arrival. To see if I had maybe a leaking fresh water tank bladder on my brand new 2019 GD 297RSTS, I did a similar thing while towing trailer home. I filled fresh tank full in Nebraska at overnight site, and then trailered it home another 900 miles or so. Got home with a 2/3ish full tank per the monitor as well as needing about 10 minutes of fill time to "top it off".
--Brian
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07-22-2018, 01:37 PM
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#2
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Senior Member
Join Date: Feb 2017
Location: Denver, CO
Posts: 1,527
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Can you see where the overflow is on your tank? If it’s on the side and the level sensors are on the same side, it’s possible your tank is pitched towards that side and is never really full. When you stop and level your trailer, it could be getting a different reading.
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07-22-2018, 01:44 PM
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#3
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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It happened to us with two motorhomes. I needed to reroute the overflow hose up higher so it wouldn't start a siphon when cornering.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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07-22-2018, 02:02 PM
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#4
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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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Unfortunately this it 100% normal simply because RV builders are too stupid/lazy/cheap to apply a simple fix in the factory. As is often the case, they rely on customers being too timid to require that the job be done right in the first place.
__________________
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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07-22-2018, 02:38 PM
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#5
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Senior Member
Join Date: Sep 2012
Location: Palm Coast Florida
Posts: 12,995
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I have owned 3 trailers and zero had this issue but I can see how it can happen.
My one trailer has a valve when the tank is full the valve opens and let's out excess water. I see water dripping and know the tank is full. Maybe you have the same set-up and your valve is stuck open. As you drive water sloshes out.
This trailer does not have a gravity feed water fill. It requires a city water hook-up to put pressure water into the fresh water tank with a valve turned to allow the fresh water tank to fill.
Oh, maybe you have a bad valve that let's water siphon back out.
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07-22-2018, 02:48 PM
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#6
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2010
Posts: 1,799
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Put a valve on the overflow line so it cannot siphon, or put a vacuum breaker on the line to eliminate siphoning.
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Scott Brownstein
Palm Island, Florida
2015 Georgetown 335DS
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07-22-2018, 02:53 PM
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#7
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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If the overflow line is creating a siphon, a simple fix is to poke or drill a tiny (1/16") hole in the high spot of the overflow hose. This will prevent a siphon by allowing air into the line as water flows down the hose. A siphon only continues as long as the water in the line is just water. Any air introduced will stop the siphon.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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07-22-2018, 02:55 PM
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#8
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2010
Posts: 1,799
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Quote:
Originally Posted by BFlinn181
If the overflow line is creating a siphon, a simple fix is to poke or drill a tiny (1/16") hole in the high spot of the overflow hose. This will prevent a siphon by allowing air into the line as water flows down the hose. A siphon only continues as long as the water in the line is just water. Any air introduced will stop the siphon.
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Yep...poor man's vacuum breaker!
__________________
Scott Brownstein
Palm Island, Florida
2015 Georgetown 335DS
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07-22-2018, 05:42 PM
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#9
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Registered User
Join Date: Jul 2017
Location: Cincinnati, OH
Posts: 34
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Thanks all. I guess I will need to remove the underbelly cover to get access since this unit has the 4 seasons mode. Ugh. Will allow visual of the issue though.
--Brian
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07-22-2018, 06:35 PM
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#10
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Member
Join Date: May 2018
Posts: 54
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This topic is covered well on GD owner's forum.
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