I just upgraded from a small travel trailer with one small propane tank to a used larger travel trailer with two large propane tanks.Yesterday I wanted to check out my oven so I turned open the valve on one of the large tanks and immediately noticed a propane smell and heard a slight hissing. I made sure the connection valve was tight and tried again..same thing, so I turned the valve off and tried the other tank...same thing, smell of propane and hissing, also check tightness of connection. I tried pouring soapy water over the valves looking for a leak but saw nothing.I then disconnected one of the tanks and replaced it with a small tank of propane I was using for my barbque.When I turned the valve no hissing or smell of propane.I then took the larger propane bottle I had removed and attached it to my barbque..no hissing.no smell of propane..I reconnected the larger tank back on the trailer and tried again...hissing..smell of propane.I tried this procedure with the other large tank on the trailer and got the same exact results. I am at a quandary as to what the problem is...at this point I ready to just replace the two larger propane tanks with two smaller one like that are on my barbque...Does anyone have any idea what could be the problem? Thank you

If you can hear the hissing, you should easily be seeing bubbles in your soapy water.Try again but I think you are better to get down to a propane dealer, not the corner gas station that refills propane.

If you smell propane and hear hissing something is leaking. You either didn't put the soapy water on the right spot or the lead blew the water right off without making bubbles. Trying running your hand around the valves, regulator, etc. and listening for a change in the hissing sound. Could be a hose leak also or a connector down low beneath the trailer.Maybe it's time to just replace the regulator, valves, hoses and connectors. How old are they?

Their as old as the trailer I would imagine...its a 1999..what I dont understand is why doesnt it leak when I place one of my small tanks on the connector? and the larger tank connects fine to my barbque with no leaks..it doesnt make sense

It could be the regulator itself that is leaking.

Mind Boggle 101...Bring an Overfill Protection Device tank to Mexico. Have it empty really empty. vented to atmosphere via an external thread fitting and open to atmosphere pigtail.Try to fill it at a "gas" plant. It won't fill.Can anybody find statistics not guesswork or finger poked up --- facts of the REDUCTION in LPG POT accidents? Hard data. I sure would like to see some officially recognized hard data on this... thank you

Propane tanks mystery??? | Good Sam Community

Dutch_12078
Explorer II
Aug 11, 2017
Are all of the cylinders using the same POL (left hand threaded, internal valve threads), or ACME (large hand tightened "nut", course external valve threads) connections?
Boon_Docker
Explorer III
Aug 11, 2017
I had that problem with a pigtail. It would leak slightly between the rubber hose and the metal connection to the regulator. If I pushed down on the hose it would quit. Recheck (with soapy water) the connection between the hose and the connection to the regulator.
Squeezle
Explorer
Aug 11, 2017
MNtundraRet wrote:
It could be the regulator itself that is leaking.

if that was the case why would it NOT LEAK /no hissing, no smell when I attach the small propane tank to the trailer?
Squeezle
Explorer
Aug 11, 2017
MNtundraRet wrote:
It could be the regulator itself that is leaking.

if that was the case why would it NOT LEAK /no hissing, no smell when I attach the small propane tank to the trailer?
MEXICOWANDERER
Explorer
Aug 11, 2017
Mind Boggle 101...

Bring an Overfill Protection Device tank to Mexico. Have it empty really empty. vented to atmosphere via an external thread fitting and open to atmosphere pigtail.

Try to fill it at a "gas" plant. It won't fill.

Can anybody find statistics not guesswork or finger poked up --- facts of the REDUCTION in LPG POT accidents? Hard data. I sure would like to see some officially recognized hard data on this... thank you
MNtundraRet
Navigator
Aug 11, 2017
It could be the regulator itself that is leaking.
Squeezle
Explorer
Aug 11, 2017
Their as old as the trailer I would imagine...its a 1999..what I dont understand is why doesnt it leak when I place one of my small tanks on the connector? and the larger tank connects fine to my barbque with no leaks..it doesnt make sense
troubledwaters
Explorer III
Aug 11, 2017
If you smell propane and hear hissing something is leaking. You either didn't put the soapy water on the right spot or the lead blew the water right off without making bubbles. Trying running your hand around the valves, regulator, etc. and listening for a change in the hissing sound. Could be a hose leak also or a connector down low beneath the trailer.

Maybe it's time to just replace the regulator, valves, hoses and connectors. How old are they?
time2roll
Nomad
Aug 11, 2017
If you can hear the hissing, you should easily be seeing bubbles in your soapy water.
Try again but I think you are better to get down to a propane dealer, not the corner gas station that refills propane.

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