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Old 11-06-2014, 12:00 PM   #1
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LPG Tanks, Fittings, Servicing, Replacement

Has anyone had the opportunity to replace the 125 lb LPG tank in a Classic 325/345? I am looking at the possibility since I have been getting a whiff of gas smell when outside on the tank side. No gas odor inside the unit, fortunately, but I think at the very least the fittings, seals and regulator need to be checked and serviced. This will bring up the possibility of the need for replacing the entire system. I have no idea when the last time the LPG system was checked/serviced on this unit. If the thing can be tested and re-certified, then no problem. If I end up needing to replace - anybody got any recommendations?

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Old 11-06-2014, 12:34 PM   #2
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They make hand-held sniffers that are very good at finding leaks, and if it were mine, I would try a propane retailer to see if they have one, or if I could rent one. Leaks in propane systems are easy to fix, usually.

I seriously doubt you need to replace the entire system.

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Old 11-06-2014, 12:56 PM   #3
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I hope not!
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Old 11-06-2014, 01:32 PM   #4
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It is rare for the tank itself to leak, though it can happen if it is badly corroded from road salt. A tank replacement including regulator and fittings would cost over $1000.

Generous application of a bubblemaking solution to the fittings, valves, and regulator should identify the leak. You could apply it to suspect areas of the tank, as well.

Recertification is not required for these tanks because they are constructed to the more stringent ASME standard. Only DOT cylinders require periodic recertification.
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Old 11-06-2014, 03:10 PM   #5
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Might just be the regulator leaking. I replaced mine a while back and no more propane smell outside and around the propane tank.
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Old 11-06-2014, 04:02 PM   #6
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1986 34.5' Airstream 345
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I had some leaks on mine a few years ago. It was leaking at the threads for the fill connection and level sensor. When the tank was TOTALLY EMPTY I removed the fittings, cleaned the threads, applied new sealant and re torqued the fittings. No problems in the three years since. Some of the fittings have to be tightened to a specific alignment so the overfill float and level sensing float will work properly. If you don't feel comfortable doing this type of work you might want a Propane dealer to take care of it and install new components as needed. I wouldn't assume the tank is bad without checking with a soap solution to locate the leaking area(s). Take the time to check for leaks before you take it anywhere for work. That will give you a little idea of what should be done and you can gauge if you are being ripped off. At least you can discuss it further. The dealer may have good reason for any extra work but at least you won't be walking in cold.

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Old 11-06-2014, 04:02 PM   #7
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That's what I'm thinking. My first step is to replace all of the fittings gaskets and possibly the regulator.
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Old 11-06-2014, 05:09 PM   #8
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I had the same symptoms and it turned out to be the fitting leading into the regulator.
Up here in the Big Frozen North the main valve has to be replaced every 10 years and the system certified every 5 years. It was a relief to find out the tanks are pretty bulletproof ASME units and you can refinish them yourself.

The tank I got quoted almost $2,500.00 to replace installed.

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Old 11-06-2014, 08:38 PM   #9
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I had my tank out for sand blast, paint and a new valve, you can read about it here. From my research at the time I think all the classic mohos used the same tank and none are available. The tank was easy to remove and a good propane supplier should be able to service and replace any needed parts. As you can see from my experience anything can be fixed. Good luck.

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