How do i find a VERY slow propane leak? - Page 3 - Fiberglass RV


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Old 03-20-2012, 06:09 PM   #29
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Bob you raise a really **good** point!! You are correct these types of gauges are pressure indicators. Come to think of it mine drops down to nothing when the tank is shut off. When the tank is turned back on the gauge should go back to the same fill position it was in prior to shut off..... if it does then its a good bet he doesn't have a leak. why didnt I think of that prior!!! lol
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Old 03-20-2012, 07:00 PM   #30
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Listen to Greybeard.

It's to dangerous to ignore, The lines must be pressure tested for a 24 hour period.

How it is done: A meter is installed and The lines are pressurized then the gas supply is turned off and a meter reading is taken then 24 hours later the meter is read again and if the reading is the same, the lines are OK. The following site will show what the meter looks like. You may have to install an additional valve between the tank and your line in order to get a positive turn off. I strongly suggest you have a gas man do your testing for you. Contact your local Propane Gas dealer.

Gas LPG Propane Manifold Pressure Gauge Manometer HVAC | eBay
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Old 03-20-2012, 07:28 PM   #31
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I'm sorry, but can someone explain to me why these are designed to leak when closed? That makes absolutely no sense to me. So, I'm supposed to have my trailer sitting in my garage with the valve wide open and hope that my kids never turn the stove knobs to on? I'm totally confused here.
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Old 03-20-2012, 07:40 PM   #32
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Bryan they are not designed to leak when the tank valve is closed. But if you leave the tank valve open while you have it parked in your garage and let your kids go in and turn the knobs on the stove then yes you will have propane leaking big time!
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Old 03-20-2012, 08:25 PM   #33
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how old is the regulator on the trailer. I changed mine solved my problum
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Old 03-21-2012, 05:53 AM   #34
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i don;t think you have a problem, but to be sure have it checked by a propane or rv dealer.
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Old 03-21-2012, 05:39 PM   #35
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I also don't think you have a problem.
If the residual pressure is leaking out very slowly after the tank is turned off, it may be due to a leak or maybe not.
Here is a video that may help you determine what's happening.
RV Videos - Mobile RV Repairs, Maintenance and Services
Dosen't go into a lot of detail and implies that a leak, such as you describe, is nothing to be concerned about.
Easy for him to say :-)
Richard
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Old 03-21-2012, 07:00 PM   #36
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I have a 20lb bottle with that gauge - we always purge the lines of gas when we finish BBQ'ing and the gauge never drops. Only time it reads in the red is when the tank is empty.

If that gauge is after the shut off valve and it drops - where is the gas going? While I understand the reason behind a self purging system, in the wrong situation that could be dangerous.

How old is the trailer? Older hoses or pipes could have been cracked or nicked when the new device was installed. I remember fixing air leaks on old semis that still have copper air lines. When you tighten one leak, a fitting 10 feet away got jarred and started leaking or cracked and had to be replaced. Newer synflex hoses helped but only as much as the quality of the installer.

Sorry to ramble, but I would track down where that gas is going.

Jason
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Old 03-21-2012, 08:52 PM   #37
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There is no reason for the gas system to lose pressure weather the tank valve is on or off. The only two things that will lower pressure is 1. a leak 2. a temp drop (pressure reading will be lower but not gone). Many times the stove burner valves may leak, the water heater or furnace gas control may have a leak on the knob. If this is the leak, the control must be replaced (expecially in such small trailers. The purpose of the hole in a regulator is to allow the diaphram to move back and forth to regulate pressure, this also should not leas gas and soaping the hole may cause the regulator to malfunction. You can have the system checked with a manometer and it will tell you if you have a leak, but you still will not know where the leak is.

hope this helps,

Art
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Old 03-22-2012, 07:31 PM   #38
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Looks like a non issue.

After two nights and three days of camping: cooking cooking all my meals and heating all night with propane I used less than a pound of propane.
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