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Old 10-20-2004, 01:10 AM   #1
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1962 22' Safari
2016 30' Classic
Somewhere , in the USA
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Question '66 Fresh Water Tank Leak

Well after replacing the burst pipe and the water pump due to leaks, we found out just before our last trip that the fresh water tank also leaks, so we again could only use "city water". Back home now, I am wondering how to repair the leak.

Let me explain the setup in our "old" trailer. The tank itself is plastic. There is a "hose fitting" that connects to the pump. The problem is with the rudementary water gauge piping. The gauge is nothing more than a piece of clear tubing in the front gaucho armrest. The clear tubing is connected to the tank via copper pipes, one near the bottom and one at the top of the tank. The leak is occurring where the lower copper pipe connects to the plastic tank.

How do I repair this? To tell you the truth, I have no idea how this joint was sealed by the factory. Can the fitting on the tank be removed and perhaps new sealing washers installed? The only other idea I can think of is to slather some type of goop on the joint. If I do this, I am not sure what to use. It would have to stick to both the copper tubing and plastic tank, probably be a little bit flexible, but definitely not "attack" the plastic and make it brittle or melt. Any ideas?



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Old 10-20-2004, 05:30 AM   #2
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1967 26' Overlander
Huntsville , Alabama
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What you described is extremely similar to the problem I have in my '67 Overlander. The PO slathered RTV all over the lower sightglass fitting.

My tank, which is blue in color, is made of, I believe, the type of plastic (polyethylene?) which glues will not stick to. The only way to fix it is to plastic weld it. Stores sell special tools to do it, and a lot of radiator shops have them.

I have read encouraging stories of other people using soldering guns & paint stripper hot air guns with good results. For filler material, apparently plastic coffee can lids work quite well.

My tank has not been repaired yet because I can not decide on whether to fix the sight glass setup, or plug the hole (easiest), and gauge the amount of water left in the tank by other means.

Good luck!


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Old 10-20-2004, 12:32 PM   #3
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McHenry County , Illinois
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OH... Now I know what the 1/4 NPT pipe plug in the tank was "repairing". In the 5 years I've had the coach it hasn't leaked. Maybe it's possible to thread a nipple, with sealer, in the holes and then attach new plastic/copper elbows and tubing to that.
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Old 10-20-2004, 03:48 PM   #4
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1966 22' Safari
Los Angeles , California
Join Date: Feb 2003
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I had the exact same leak on my 66 Safari, and I tried everything to fix it, from marine epoxies, to goopy thread sealers, even fiber glass. Absolutly nothing sticks to the plastic tanks. I however did not try to heat weld it, since it was right at the thread joint. It was making me crazy, because I go to the dessert and dry camp a lot, and rely on my water for backup drinking water.

what I did do, was install a brand new tank, which took a bit of engineering to find one that would fit. Rod at C&G Trailers was a big help to me (800.662.3790). I just gave him the dimensions, and he had one custom made. It cost me about 150 bucks, but now I have a brand new (clear) tank that I can see my water level through the plastic.
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