Casita Water Tank Leak - Fiberglass RV


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Old 05-19-2014, 03:52 PM   #1
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Casita Water Tank Leak

OK. My wife and I were getting ready to leave for a camping trip. The first campsite we were getting had no water hookup, so I decided to fill the onboard tank with fresh water before we left. As soon as the tank was full, I noticed water dripping under the trailer (17-foot Freedom Deluxe model). I opened the door and realized that the floor was also soaked! Of course I immediately drained the tank and began the task of drying the carpet.

We were on a tight schedule, so went ahead and headed out and just went without onboard water until we got to the second campground which had city water. The leak is only associated with the 24-gallon tank. No leak from the water heater or the water hookup.

Any ideas what could be wrong before I haul it into the service center?
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Old 05-19-2014, 04:58 PM   #2
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You don't mention where you live, but if you get freezing temps there in winter you may have a serious problem with cracked lines. Other possibilities are cracked or loose fittings, a cracked tank or a cracked filler tube. Also take a good luck at the water pump, it is usually a gravity feed from the tank.

There are so many possibilities that it may well pay you to uncover everything, put in just a gallon of water, and try to trace down the leak yourself.

It could be as simple as a loose hose clamp. But ya gotta look.
Good luck
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Old 05-19-2014, 05:36 PM   #3
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Casita Tank

We live in NC. I had anti-freeze in the tanks and lines this winter (which was certainly cold enough to freeze and crack lines). I did try putting just a few gallons in to see what would happen and there was no leak.

It could be the fitting to the water heater. That's a possibility.
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Old 05-19-2014, 05:57 PM   #4
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You mentioned in the first post that you were able to use the City Water connection without problems.

Except for the low pressure line between the water tank and the pump, the city water connection would put water pressure on the entire system and cause your leak again. That pretty much rules out all of the plumbing except that one line.

Sounds like it is the tank, line to the pump or the pump itself. And, in as much as most builders use the pump itself as a check valve to keep city water from entering the tank, you can cross off half of that as well.
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Old 05-19-2014, 06:12 PM   #5
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Perhaps the pump or line in or out is the problem, especially if you didn't run the pump dry when winterizing.
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Old 05-19-2014, 06:48 PM   #6
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We had a leak where the line comes out of the water tank at the back - it was cracked at the thread. We ordered a new tank from Casita and haven't had a problem since. We've also always winterized ours. We put stronger pieces of wood to attach the straps that hold the tank down - the ones currently in there are particle board and if they got wet you might have a runaway tank in your future.
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Old 05-19-2014, 08:57 PM   #7
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We had a cracked filter / screen on the discharge side of the water pump
The crack would slowly drain the on board tank at zero pressure and drain the tank quickly when running the pump
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Old 05-21-2014, 10:13 PM   #8
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It's a chore, but I would lift the seat over the tank to see what the problem is. It happened when you filled the tank. Could the fill pipe have come loose?
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Old 05-26-2014, 07:10 PM   #9
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All of those are possible, I suppose. We'll know in a couple of weeks when we take it in for servicing. I hope we don't have to replace the entire tank. My suspicion is that it's a much easier fix than that.
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Old 06-28-2015, 06:19 PM   #10
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Where is the pump on the casita 17 freedom. Is it under the slanted board under the bed?


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Old 06-28-2015, 06:31 PM   #11
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Okay. There were TWO major problems that resulted in the leak. In fact, there were two different leaks. The catastrophic one was due to the failure of a valve section in the pipe system leading from the freshwater tank. Replaced and fixed and perfect. Then a secondary leak showed up when the folk at the RV repair (yes, I had to take it in for professionals to fix) place fired up the hot water tank which began leaking as the water warmed up. The water heater was full of rust and basically ruined. So I had to replace the hot water heater. Now the Casita is in perfect working order. Freshwater tank fixed and operating properly. Hot water heater replaced and working perfectly. New awning. Everything is copacetic.
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Old 06-28-2015, 06:46 PM   #12
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Thanks for the update Bob. What was the valve/line problem ? Kind of like to check mine out also being it's a SD17.
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Old 06-28-2015, 07:06 PM   #13
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It was a situation where the plastic had become so brittle that a section of the pipe deteriorated and cracked.
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Old 06-28-2015, 07:44 PM   #14
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Good you got it all sorted. Was the anode all eaten up in the water heater hence the rust!
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