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Old 03-25-2014, 08:09 PM   #1
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1968 28' Ambassador
Ojai , California
Join Date: Mar 2014
Posts: 13
How do I find and repair leak in propane lines?

In my 68 Ambassador, a check was run on the propane system and it took about 2 minutes to lose pressure, which means there is a leak. I was told that it should hold pressure for at least 3 minutes, and preferably 5 minutes.
I see that the lines run under the body of the chassis.
Has anyone else had a lead repaired? Is it costly, a nightmare, etc?
Is this something I can fix myself (not a mechanic), or can an RV shop or specialist fix this easily?
Thanks! Jim
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Old 03-25-2014, 08:14 PM   #2
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1979 23' Safari
1954 29' Liner
Orange , California
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Jim,

Apply soapy water to the fittings and lines, the leak will bubble. If a fitting leaks, try tightening, if the line leaks, replace. You will also need to follow the lines into the trailer to the appliances. There may be shut off valves where the line goes to the appliance, if so, shut them off before searching for the leak then turn them on one at a time.


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Originally Posted by jimblacker View Post
In my 68 Ambassador, a check was run on the propane system and it took about 2 minutes to lose pressure, which means there is a leak. I was told that it should hold pressure for at least 3 minutes, and preferably 5 minutes.
I see that the lines run under the body of the chassis.
Has anyone else had a lead repaired? Is it costly, a nightmare, etc?
Is this something I can fix myself (not a mechanic), or can an RV shop or specialist fix this easily?
Thanks! Jim
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1973 Dodge W200 PowerWagon, 1977 Lincoln Continental, 2014 Dodge Durango
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Old 03-25-2014, 08:28 PM   #3
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1987 25' Sovereign
Oregon , Ohio
Join Date: Nov 2010
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For 35 years I repaired leaks on natural gas lines in Ohio. Preferably there should be no pressure drop at all, no matter how long. Propane is heaver than air and will settle to low spots and accumulate. Evan though you see lines under your trailer, they go into feed the furnace, stove and hot water tank. The best way for you to test the lines is to get a spray bottle and use soapy water to spray all the fittings with the lines pressurized. The soapy water will bubble where there is a leak. Start at the propane bottles and work your way back. It is most likely a fitting that is loose and can be tightened, if not than you will have to soap down all of the copper lines to check for bubbles. You will need to do this outside where it is well ventilated if you are using the propane to pressurize the lines
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Old 03-25-2014, 09:02 PM   #4
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1991 34' Excella
Princeton , New Jersey
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You don't have a leak you have a hole. Pressure dropping that fast you would be smelling it. Did you see the pressure drop that fast or is a dealer telling you this. I ask this because the description of a 2 1/2 minuite test is a farce. The system should hold pressure once pressurized and the tanks turned off for weeks

Is it possible that the oven pilot is on? If so you will smell gas if you open the door after the gas is on for a minute.

When you start with the soapy water start right at the tank valve and if equipped at the gauge. Soap everything.
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Old 03-25-2014, 09:24 PM   #5
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1969 31' Sovereign
Broken Arrow , Oklahoma
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Start with the easy stuff make sure ALL stove and oven knobs are "fully" off it is easy to leave the oven on the pilot if all fully off then get out the soapy spray and do as above recommend.
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Old 03-26-2014, 12:19 AM   #6
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1988 Argosy 32
Lomita , California
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2 tanks ? how old is the ruber hoses from tank to regulator, i use 409 spray it makes Big bubles.
I found that my stove had a small pilot light for the top 4 burners that had to be relit every tine the gas was turned off & on, (yes that is a leak) thank you attwood.
My fix was a 1/8 pipe plug, and we now use a bbq spark lighter.
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Old 03-26-2014, 12:41 AM   #7
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1968 28' Ambassador
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Thank you all for the responses! Much appreciated!

Much appreciated!
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