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Old 05-16-2011, 06:24 PM   #1
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Filling fresh water tank on 378TS

Has anyone every tried filling their fresh water tank and have the overflow line syphon the tank down to about half full and if so what did you do for a remedy? This has happen to me and a friend that has a 378TS also. My friend said he put a tee in the line as close as he could to where it came out of the tank and put a 1/4" line on it to run the overflow out of the compartment. He said it works like a vent to break the suction. Will this work? I should think it would.
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Old 05-18-2011, 12:29 PM   #2
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This is a problem on the 370 xl also. The vent is about aq 3/4" hose that hangs down (looks like pool filter hose) white in color. I went to Lowe's and got a plastic gate valve and installed it on the end of the hose then secured it a bracket with a zip tie. I covered the end with a screen so no bugs could enter. Now I open the valve, fill the tank then close the valve and go. When I set up camp I open the valve and I never loose water in travel. When I visited the FR factory I told them about this and they didn't want to hear it!
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Old 05-18-2011, 12:48 PM   #3
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This is a problem on the 370 xl also. The vent is about aq 3/4" hose that hangs down (looks like pool filter hose) white in color. I went to Lowe's and got a plastic gate valve and installed it on the end of the hose then secured it a bracket with a zip tie. I covered the end with a screen so no bugs could enter. Now I open the valve, fill the tank then close the valve and go. When I set up camp I open the valve and I never loose water in travel. When I visited the FR factory I told them about this and they didn't want to hear it!
Did the same thing. I cut the end off about 3" long with the piece of screen on the end. Took it to HD, closer than Lowes, and matched up a 1" PVC Valve. I had a roll of white electrical tape so I put it all together and haven't lost a drop since. Just need to remember to open it when we're on the tank.
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Old 05-18-2011, 01:22 PM   #4
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You won't believe this, I still don't. I filled up the tank for the first time this weekend and let it overflow so I knew it was full, then the tank COMPLETELY drained. There were lots of guys standing around scratching their heads. I then filled it up to about 3/4 with no issues.
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Old 05-18-2011, 03:48 PM   #5
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You won't believe this, I still don't. I filled up the tank for the first time this weekend and let it overflow so I knew it was full, then the tank COMPLETELY drained. There were lots of guys standing around scratching their heads. I then filled it up to about 3/4 with no issues.
I believe you. The first few times this issue was posted I replied I didn't have any problems. Thought I must have gotten something everyone else didn't . Well that lasted about three trips. We traveled to see our daughter at College in Lynchburg VA. The road into the campground we stayed at was in pretty bad shape. We rocked and rolled in and when we arrived they was next to nothing left in the fresh water tank. It didn't present a problem because we were hooking up to the water at the site but we started out with about 1/2 tank. We drove our car out about 25 minutes after we arrived and the road in had a long trail of my water. I guess it only takes enough slooshing for it to make it out of the end of the vent and the rest just followed. Bought the valve the day we got home. No problems since.
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Old 05-18-2011, 04:30 PM   #6
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My overflow tube next to the fill hole is caulked over. I have a tube hanging under the camper that overflow water appears to comes out. Are you guys installing a valve on this overflow tube? What causes it to drain in travel? I'm new to this cause my popup fill tube would spit out water where I was adding it I didn't have this lower overflow tube.
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Old 05-18-2011, 05:24 PM   #7
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My overflow tube next to the fill hole is caulked over. I have a tube hanging under the camper that overflow water appears to comes out. Are you guys installing a valve on this overflow tube? What causes it to drain in travel? I'm new to this cause my popup fill tube would spit out water where I was adding it I didn't have this lower overflow tube.
It's supposed to be a vent to allow the tank to breathe when using water from the tank without collapsing the tank. If there's enough water in the tank and it slooshes around during travel and runs out the vent it creates a siphon and pulls most of the remaining water with it. This is the line I installed a valve in. In my case it's in the propane compartment next to the low point water drain and the drain for the fresh water tank. It looks like a pool filter water hose, ribbed and flexible with a screen taped to the end to keep out bugs.

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It's actually a 1" CPVC Valve I used.
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Old 05-18-2011, 08:40 PM   #8
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Water Siphon

There is an old thread probably findable using "siphon" as a search term in this site. We solved this one last year using an air release valve on the water overflow line. It allows air to escape while you are filling up the tank but closes when water arrives down the overflow tube. Only warning is that you can easily overfill your water tank and bow the floor above it. Been there and done that. Answer is to watch the water filling process to ensure that you stop before too full. You can actually get more than the rated gallons stored this way to extend your dry camping time.

The advantage of the air valve is you don't have to remember to open or close anything during travel or setup. When you are pumping water out of the tank, the overflow line empties via suction from the water storage tank. The air valve allows air flow so no restriction. Only water exhaust is stopped. These valves are available at irrigation supply houses for a dollar or two and the rest of the PVC parts will set you back another couple of bucks max. You do have to watch for overfilling but that's it. Here is a picture of the valve and the PVC parts I used at the end of the overflow line. If anyone wants more detail, I'll dig it up.
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Old 05-18-2011, 10:54 PM   #9
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MY 2011 360 has the tank drain at the right rear side right underneath the compartment that houses the water pump. The drain for the tank is there as well as the overflo. The overflo tube is a one inch clear plastic pipe and it has a screen over the end of it....now I am curious...I will fill it and see what happens.
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Old 05-24-2011, 02:52 AM   #10
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My 2010 330TS has all the plumbing in the same location as Ron's with the clear tubing and screen end.

I'll be watching when I fill for the same "empty" feeling.
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