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Old 06-23-2015, 02:06 PM   #21
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I agree Cosmik. I don't understand the overflow with these FW tanks. I had an Airstream 2006 model with only a breather at the fill inlet. No overflow tubes. never had any problems. The only thing I can figure is the design of the tank may cause it to bulge so air needs to escape quickly, or something like that.
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Old 06-23-2015, 02:19 PM   #22
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Hey now...I'll take Ellie Mae.

Just sayin..
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Old 06-23-2015, 02:21 PM   #23
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Hey now...I'll take Ellie Mae.

Just sayin..
Which one, Donna or Erika?
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Old 06-23-2015, 03:32 PM   #24
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Donna!!!
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Old 06-23-2015, 03:57 PM   #25
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are you sure?
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Old 06-23-2015, 09:10 PM   #26
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Here's what I did. A couple of plastic garden hose fittings (1/2") and matching caps. I leave them on when filling the tank, until the water runs out of the filler. Then I remove the caps. The water gushes out at first, but quickly slows to a trickle. I put the caps back on and the monitor panel still reads full. Doing it this way, it looks like the tank is full but not over-full, and won't drain itself during travel.



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Old 06-23-2015, 11:18 PM   #27
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Our 2015 28BHBE had the same problem. Would siphon out over 1/2 tank of water in 208 miles. Water would pour out of overflows in every right turn as the drains are on road side of TT under the slide.

I put a pair of elbows on the tubes and clear tubing extended across to curb side of unit and installed shutoff valves on the ends and located them beside FW tank drain. This way they are directly below the fresh water fill port, and i do not have to crawl under TT to open/close the little tap when filling tank.

I have overfilled the tank even with the overflow drain valves open, and water also comes out the vent tube and fill port. (it takes a long time to drain 80 gal)

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Old 06-24-2015, 06:21 AM   #28
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are you sure?
Um..nevermind. :(
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Old 06-24-2015, 09:13 AM   #29
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Here is a link to another thread that deals with this extensively.
https://www.jaycoowners.com/forums/f7...es-3503-6.html
You can skip the first 4 or 5 pages, as they contain mostly people refuting the OP's assertion that the tanks lose water and siphon. Those of us that have/had this problem know it is true! The last several pages discuss solutions.

A couple things to remember to do after you have installed valves or clamps on the overflow tubes:
1. ALWAYS have the valves open while you are filling. On several Jayco models, especially those with 90+ gallon capacity, there are TWO fresh water tanks. The gravity fill goes into the first tank, and a set of hoses between the tanks equalizes the water level. But only the first tank has a dedicated vent to allow air to expel as the tank fills with water. The second tank uses the overflow tube as an air vent. Once your tank is filled and water begins to flow from the overflow, that is the time to stop filling and close the valve, while you travel.
2. Similarly, when you arrive at your site, it is important to RE-OPEN the valve on your overflow. Again, it is that second FW tank that needs to get air as your water pump draws water from your tanks. Because the tanks are full, the hoses between the two tanks are filled with water and air cannot get to the second tank other than via the overflow. It probably will not actually hurt anything, but I forgot to open them up recently, and when we were finally leaving our site and I did open the valve, there was a couple of minutes of gurgling, as the 2nd tank sucked in air, so I definitely had negative pressure in that 2nd tank.
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Old 06-24-2015, 10:06 AM   #30
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Here is a link to another thread that deals with this extensively.
https://www.jaycoowners.com/forums/f7...es-3503-6.html

The gravity fill goes into the first tank, and a set of hoses between the tanks equalizes the water level. But only the first tank has a dedicated vent to allow air to expel as the tank fills with water. The second tank uses the overflow tube as an air vent. Once your tank is filled and water begins to flow from the overflow, that is the time to stop filling and close the valve, while you travel.
I have the 2 tanks you speak of with my advertised 86 gallon capacity but I have 2 overflow vent tubes. I assumed 1 for each tank?
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