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05-22-2021, 02:13 PM
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#1
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Junior Member
Join Date: Nov 2018
Location: Katy
Posts: 12
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Fresh Tank shows 1/3 full when completely full
Hello,
After flushing system after winterizing, my fresh tank only show 1/3 full when water starts spitting out of the fill nozzle. I think I read something that could be related to the overflow vent but can't find any definitive posts. Any help or where to look would be greatly appreciated. I have a 2008 Keystone OUtback sydney 29RLS.
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05-22-2021, 05:10 PM
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#2
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,237
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How fast is the water running? If the vent line is pinched, it could cause back pressure. Does your trailer have a seperate fresh fill? If so the vent line is right next to the fill port.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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05-22-2021, 05:33 PM
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#3
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Junior Member
Join Date: Nov 2018
Location: Katy
Posts: 12
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Chuckster57, my RV has a gravity fill line, then what I call a city water hose hookup. I need to look and see if there is some sort of a vent there as I've never paid close attention. Thanks!
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05-22-2021, 08:00 PM
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#4
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Senior Member
Join Date: Jul 2013
Location: Box Elder
Posts: 2,899
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It’s also possible that a couple wires to the sensors have become disconnected. We had the common break a couple years ago giving us a complete empty indication. Yours could be the top and middle wires disconnected.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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05-23-2021, 02:26 AM
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#5
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,804
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How long does it take to start spitting? Is the hose going full blast? When I fill my boat up if I don’t leave an air gap it will develop back pressure and shoot out of the fill neck like a geyser.
Maybe you could fill it where you think it’s full and then drain off the tank into a five gallon bucket and count how many it takes to empty the tank to measure the amount of water actually in the tank.
The vent is on the filler neck I believe. Not sure if the cap covers it when it’s on. Maybe a bug clogging the vent up ?
__________________
2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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05-23-2021, 02:33 AM
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#6
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Senior Member
Join Date: Mar 2021
Location: Fort White, Fl.
Posts: 688
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I picked up one of these https://www.amazon.com/dp/B0187BOFD6...roduct_details to monitor how much fresh water I was loading for when traveling. I like to only carry 10 gallons just in case need a road side rest stop. Maybe something like this could help you determine what exactly is going on.
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Rick
2021 Alpine 3790FK
2021 Ford SD F350 6.7 PS 4x4 Crew Cab LB Dually
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05-23-2021, 09:00 AM
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#7
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Junior Member
Join Date: Nov 2018
Location: Katy
Posts: 12
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Thanks all for the suggestions and tips. The RV is 90 miles away at our weekend property but I'll be there this coming weekend to with a plan to try all these suggestions out to fix the problem.
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06-04-2021, 03:07 PM
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#8
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Senior Member
Join Date: Jun 2020
Location: Box Elder
Posts: 147
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We've had the same problem over & over. Sometime it's full, sometim, empty, sometimes 1/2 etc.
The one commonality is different water chemistry. Alcilinity (sp?) etv, &/or solids.
Drove me nuts till I worked that out.
Get a swimming pool test strip kit & check your water out as it goes in & after you run it for awhile. Any difference it's your FWT & plumbing.
If they're the same check your source.
__________________
Mot
Love our Cougar full time
TT 2020 Cougar 24sabwe 38,000 miles, TV 2004 chevy 2500 HD 4x4 287,000 miles.
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06-05-2021, 04:36 AM
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#9
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Senior Member
Join Date: Sep 2016
Location: Kamloops, BC
Posts: 370
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I had this issue on my old trailer, does it seam like the proper amount of water is going in? in mine it realy was only getting a partial tank as the vent line was louped and creating an air lock and causing the water to back flow out the filling port. I had to shorten the filling line and zap strap it on a proper angle and then my tank capacity doubled.
Steve
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06-05-2021, 06:19 AM
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#10
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Senior Member
Join Date: Nov 2018
Location: Norwood, CO
Posts: 667
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Quote:
Originally Posted by Life-in-Him
We've had the same problem over & over. Sometime it's full, sometim, empty, sometimes 1/2 etc.
The one commonality is different water chemistry. Alcilinity (sp?) etv, &/or solids.
Drove me nuts till I worked that out.
Get a swimming pool test strip kit & check your water out as it goes in & after you run it for awhile. Any difference it's your FWT & plumbing.
If they're the same check your source.
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FWT ???
Please explain, Thanks.
__________________
German Shepherd Guy
2018 Keystone 26RBPR
2014 Suburban 2500, 6L with 3.73 rear
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06-05-2021, 07:11 AM
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#11
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Senior Member
Join Date: Oct 2018
Location: San Antonio
Posts: 335
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Fresh Water Tank???
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Steve & Patti
2018 Grand Design Reflection 315 RLTS
2019 Chevy 2500 HD Diesel Z71
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06-05-2021, 08:28 AM
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#12
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Senior Member
Join Date: Nov 2017
Location: Picacho, Az
Posts: 6,809
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I'd say if it's running out the vent or overflow it's full regardless of what the worthless POS sensor may show. Those sensors on ALL of your holding tanks will drive you nuts trying to make them work accurately, believe me it's not worth the time, trouble or $$, ignore them.
__________________
Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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06-05-2021, 08:54 AM
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#13
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Senior Member
Join Date: Jul 2013
Location: Liberty, Texas
Posts: 5,021
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You can measure when you drain it like previously mentioned. Compare that to what spec is for the tank capacity. Or, you can open your house valve with the hose attached and see how long it takes to fill a 5 gallon bucket. Then without changing the flow rate start filling your tank and time how long it takes.
I just pretend that I don't have tank sensors. Makes life less stressful.
__________________
2018 Ram 3500 Laramie CC DRW LWB 4X4 Cummins Aisin 3.73
Reese Goosebox 20K
2018 Heartland Landmark 365 Oshkosh
2008 Bigfoot 25C9.4 LB Cabover
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06-05-2021, 10:22 AM
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#14
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Senior Member
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,456
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Quote:
Originally Posted by gearhead
You can measure when you drain it like previously mentioned. Compare that to what spec is for the tank capacity. Or, you can open your house valve with the hose attached and see how long it takes to fill a 5 gallon bucket. Then without changing the flow rate start filling your tank and time how long it takes.
I just pretend that I don't have tank sensors. Makes life less stressful.
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I can't remember the last time I even looked at our gauges...
__________________
2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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06-05-2021, 11:32 AM
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#15
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,846
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Keystone trailers have gauges???
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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06-05-2021, 11:41 AM
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#16
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,714
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Quote:
Originally Posted by JRTJH
Keystone trailers have gauges???
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IIRC they sowed them to me during the PDI but that was a long time ago.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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06-05-2021, 11:45 AM
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#17
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Senior Member
Join Date: Jan 2019
Location: Coaldale (Southern Alberta)
Posts: 176
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Yes they do! But if they're not hooked up like three of mine were, oh forget it they are a lot less annoying if you don"t bother looking at them.
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& Jim & Tovi
2019 Cougar 315RLS w/ Reese Sidewinder pin box
2011 Ram Larime CC 3500 SB 4x4 w/ Reese 5th wheel hitch
Retired-Lovin' 7 Saturdays a week!!
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06-05-2021, 11:47 AM
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#18
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,846
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Quote:
Originally Posted by flybouy
IIRC they sowed them to me during the PDI but that was a long time ago.
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Quote:
Originally Posted by jim1
Yes they do! But if they're not hooked up like three of mine were, oh forget it they are a lot less annoying if you don"t bother looking at them.
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Oh, you mean those green and red lights on the wall panel ???
Hell, I thought that was Keystone's poor excuse for Christmas decorations.... Status gauges, eh ???? Who'dathunk......
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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06-05-2021, 11:49 AM
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#19
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,714
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Quote:
Originally Posted by JRTJH
Oh, you mean those green and red lights on the wall panel ???
Hell, I thought that was Keystone's poor excuse for Christmas decorations.... Status gauges, eh ???? Who'dathunk......
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Yup, I thought they were a low voltage alternative to thebold Lava lamps.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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06-05-2021, 11:54 AM
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#20
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Senior Member
Join Date: Jan 2019
Location: Coaldale (Southern Alberta)
Posts: 176
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Kinda like the cross walk button for pedestrians, not wired to anything behind it, just a pedestrian pleaser keep pushing it!! Sooner or later it'll change.
__________________
& Jim & Tovi
2019 Cougar 315RLS w/ Reese Sidewinder pin box
2011 Ram Larime CC 3500 SB 4x4 w/ Reese 5th wheel hitch
Retired-Lovin' 7 Saturdays a week!!
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