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Old 04-06-2014, 03:07 PM   #1
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Question LP gas pressure mystery

I have a '95 class A with no history of LP gas leaks. My unit has been parked at home for about five months and I recently inadvertently left the fridge on gas mode for an extended period of time. I discovered that the unit had run out of gas and had the tank filled. To check to see if I had a leak (in addition to having left the fridge on gas) I turned the tank valve OFF and observed the low pressure gauge inside the unit. Within 24 hours it had dropped from normal of 5-1/@ to 6 lbs to about 3. I checked for leaks (soapy water) and found none. With the tank valve again turned OFF the interior gauge was again reading 5-1/2 to 6 and stayed there for over two days with absolutely no drop which led me to think that I may have accidentally hit the "GAS" mode when resetting the fridge temp setting (after I had turned the gas off. But then in the past 24 hours it again dropped to 3 lbs. I will watch it for a couple of more days to see if it continues to drop before taking it in for a "sniffer" test.

Has anyone experienced a similar situation? Is there any likelihood that the interior low pressure gauge is erroneously fluctuating? Any other thoughts before I take it in for a sniffer? My wife thought she caught a strong gas order at the regulator -- could it be sporadically leaking from/on the low pressure side?

Its got me scratching my head!, thanks,


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Old 04-06-2014, 03:20 PM   #2
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lbs or inches of water column?

Anything can start and stop leaking.
A lot of times the gas valves for the furnace and water heater will leak by internally.

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Old 04-06-2014, 03:27 PM   #3
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Dont worry about it. Leak test is generslly run for 30 minutes, not hours.
Don and Lorri
2007 Dodge 3500 dually
Resident Dummy.
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Old 04-06-2014, 03:52 PM   #4
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Propane "pressure" is greatly affected by ambient air temperature. If you're taking your readings at different temperatures/time of day, that may account for the differences you're seeing.

Link to source/explanations

That said:

Professional pressure testing of propane systems is pretty cheap, at least around here. We get ours done every so often for less than thirty bucks at a local RV shop.
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Old 04-06-2014, 06:59 PM   #5
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LP Pressure Mystery

Thanks to all that replied. The interior gauge is in ozs./sq. inch
I retested for an hour and there was no discernible drop so I'm not gonna worry about it. I did run all the gas units (except the oven and stovetop burners) thru several on/off cycles to see if that might cure any valve leak thru problem. The reason I was concerned is that in all the years I have owned this unit the gauge has never indicated a drop that I was aware of, but I have generally left the gas on even when parked at home -- I will now turn it off when parked.
Thanks again,
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