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Old 07-11-2014, 11:18 AM   #15
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2011 Itasca Model IFE30W ; Fresh Water Overflow/Vent Line Issues

Hello,

Here are the links to two photos of the situation

http://s1181.photobucket.com/user/son_of_a_singer_man/media/IMG_4297.jpg.html?filters[user]=121791893&filters[recent]=1&sort=1&o=0

http://s1181.photobucket.com/user/son_of_a_singer_man/media/IMG_4297.jpg.html?filters[user]=121791893&filters[recent]=1&sort=1&o=0


Regards, Alta Sierra
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Old 07-11-2014, 11:33 AM   #16
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One thing to watch when making any sort of mods to the fresh water system is to make sure there is no way the tank can be pressurised to more than a couple of feet head of water. Even 2' head on a full tank corresponds to 1psi which totalled over the whole top surface of the tank (and the bottom), can mean a bulging force of a ton or so on straps or even on the floor above and below the tank. Even with a gravity fill, that can still happen if you shove a 3/4 hose down the spout a couple of feet and turn the faucet full on.

Yes, yet another thing that manufacturers have been botching for 100 years and don't seem the slightest bit concerned with fixing. Why should they when the owners do it for them.

Whenever you have the vent pipe installed so the open end is below the top of the tank, there is the probability of syphoning that can start when you overfill the tank. Only safe solution is to have the open end above the top of the tank, or as some have suggested, drill a small hole at the top of the loop. Spring-loaded check valves - using two piped in parallel but facing the opposite way will also work provided the spring tension is low enough.
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Old 07-11-2014, 12:46 PM   #17
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I would put a tee at the top of that tank in place of the 90*. Then run the overflow tubing up to the top(floor) and secure it so it is higher than the tank then return it back down to the ground with your bug screen, add some length so that the tube will be higher than the tank for a good 3-4 feet before you turn in back down. Hopefully this will catch any of that water and by the time things level out it will drain back in the tank vs the overflow tube. On the other side of the tee do the same thing but try to find a opening in the floor that you can run the tube up. Maybe there is a sewer vent pipe from the black or grey water tank nearby that runs to the roof. Just get some 3/8 or 1/2 pex and shove it up there and then connect to your vent. I think you can still get some siphoning going on, especially when the tank is full or if you happen to sit unlevel.
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Old 07-11-2014, 03:24 PM   #18
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Hello!

I just finished up a modification that should stop the siphoning. I ran a 4'-0" loop of tubing (out of the 90-degree fitting at the top of the tank) over the top of the tank, and back alongside the tank fitting. Then I connected a 1/2" brass 90-degree compression fitting (having drilled a 1/8" hole in its top portion for an air vent). I used a 1/2" copper pipe strap to clamp the tubing to the underside of of the motorhome's floor pan, holding it up higher than the tank fitting.

That being done, I reassembled everything and 'slowly' filled the water tank up to the top of the 'Full' water tank sensor. That left the water level about 1-1/4" below the top surface of the tank.

A series of photos of the modification can be seen beginning at this link:

http://s1181.photobucket.com/user/so...g.html?filters[user]=121791893&filters[recent]=1&sort=1&o=0

I realize that I may still lose some water when making a right turn or stopping quickly, but hopefully it will be minimal. Thanks again for all of your help

Regards, Alta Sierra
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Old 07-11-2014, 03:40 PM   #19
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Hello!

Sorry! The link in my last post was no good...this should get you to the photos:

2011 ITASCA Water Tank Overflow _Vent Issues Photos by son_of_a_singer_man | Photobucket
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Old 07-11-2014, 07:44 PM   #20
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Quote:
Maybe there is a sewer vent pipe from the black or grey water tank nearby that runs to the roof. Just get some 3/8 or 1/2 pex and shove it up there and then connect to your vent.
This might need some explanation, because some interpretations could result in a serious health hazard.
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Old 07-12-2014, 08:28 AM   #21
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Quote:
Originally Posted by Tony Lee View Post
This might need some explanation, because some interpretations could result in a serious health hazard.
Agreed. Run it up the wall cavity where these pipes are, not in the pipe. I use the same space when I had to run solar wires to the roof.

Alta,

Looks like that may work.
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Old 07-23-2014, 05:31 PM   #22
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Hi,

I just got back from a 5-day motor home trip to the North Shore of Lake Tahoe. No water loss from the fresh water tank, in spite of the 'twisty curves' and semi-steep grades on HWY 20 heading up to I-80.

No problems with the coach's water supply through five days of dry-camping at The Sierra Pines Point State Park. Thanks again for everyone's thoughts.

Regards, Alta Sierra.
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