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Old 05-22-2021, 02:13 PM   #1
jstijerina
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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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Old 05-22-2021, 05:10 PM   #2
chuckster57
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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.
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Old 05-22-2021, 05:33 PM   #3
jstijerina
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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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Old 05-22-2021, 08:00 PM   #4
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Itís 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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Old 05-23-2021, 02:26 AM   #5
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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 ?
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Old 05-23-2021, 02:33 AM   #6
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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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Old 05-23-2021, 09:00 AM   #7
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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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Old 06-04-2021, 03:07 PM   #8
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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.
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Old 06-05-2021, 04:36 AM   #9
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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.

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Old 06-05-2021, 06:19 AM   #10
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Quote:
Originally Posted by Life-in-Him View Post
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.
FWT ???
Please explain, Thanks.
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Old 06-05-2021, 07:11 AM   #11
Texas Steve
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Fresh Water Tank???
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Old 06-05-2021, 08:28 AM   #12
travelin texans
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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.
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Old 06-05-2021, 08:54 AM   #13
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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.
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Old 06-05-2021, 10:22 AM   #14
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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.
I can't remember the last time I even looked at our gauges...
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Old 06-05-2021, 11:32 AM   #15
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Keystone trailers have gauges???
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Old 06-05-2021, 11:41 AM   #16
flybouy
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Keystone trailers have gauges???
IIRC they sowed them to me during the PDI but that was a long time ago.
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Old 06-05-2021, 11:45 AM   #17
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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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Old 06-05-2021, 11:47 AM   #18
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Quote:
Originally Posted by flybouy View Post
IIRC they sowed them to me during the PDI but that was a long time ago.
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Originally Posted by jim1 View Post
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.
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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Old 06-05-2021, 11:49 AM   #19
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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......
Yup, I thought they were a low voltage alternative to thebold Lava lamps.
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Old 06-05-2021, 11:54 AM   #20
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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.
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