Outside propane access

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Members are debating whether it’s possible and safe to connect a regulated external propane tank to an RV’s exterior quick-connect port when the onboard tank is empty. The consensus among experienced RVers is that most exterior quick-connects are designed as outlets (for grills or fire pits) and are typically located downstream of the RV’s regulator, meaning they cannot be used to backfeed propane into the system. Attempting to do so could result in pressure mismatches or venting, especially...
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matzb

Advanced Member
Joined
Oct 27, 2020
Posts
40
I know this receptacle is for providing access to propane for fire pit, grill, etc.
My question is can I plug in a regulated propane tank into this when the onboard tank is empty.
I would think that if I close the valve on the onboard tank it should work. Just to have a back up if my main tank goes dry.
 

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You have to determine if that connector is before or after the propane regulator. Don't get them confused - unregulated propane is 100-150 PSI, after the regulator it is about 0.5 PSI for distribution to the appliances.
 
The tank has a regulator so pressure is not an issue. When the onboard tank valve is shut, the system is sealed. The question is will the onboard regulator be damaged if back fed. I already have a quick disconnect next to the onboard tank, just thought this might also be an option.
 

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Not sure anyone will tell you it is fine to run gas this way as we don’t know what you have in your coach, flow rates of appliances, etc. as well as the obvious liability issues…
 
I know this receptacle is for providing access to propane for fire pit, grill, etc.
My question is can I plug in a regulated propane tank into this when the onboard tank is empty.
I would think that if I close the valve on the onboard tank it should work. Just to have a back up if my main tank goes dry.
We carry an extra propane tank for just this reason. We picked up the new tank and connector and hose at an Ace hardware. If you want more detail, hubby is still asleep, I can get those details when he gets up.
 
Since you are wanting to put regulated pressure into the system against the output of the coach regulator, I suspect no harm to the built in regulator would be done.

You really should consider installing a "stay-a-while", "Sturgi-stay", or similar device to allow you to put high pressure LP into the system between your main tank shutoff and the coach regulator.

Doing what you want to do will require a non standard adapter to get pressure into the female fitting on the coach.

Charles
 
I have seen the built in regulator vent propane if back fed .


Since gas pressure increases with heat I suspedt the regulator was designed so that if the day did what it's doing somje days wake up at freezing and by 4pm it is 70 out.. IT is designed to vent excess pressure.

So if your on board is set to say 11" and the external is 11.1 it's gonna vent (or the other way around the external vents)

So if you have two regulators both feeding the same line you need a change over valve

Better to us an extend-a-stay and feed the external in at high pressure pre-regulator.
 
Last edited:
I know this receptacle is for providing access to propane for fire pit, grill, etc.
My question is can I plug in a regulated propane tank into this when the onboard tank is empty.
I would think that if I close the valve on the onboard tank it should work. Just to have a back up if my main tank goes dry.

The tank has a regulator so pressure is not an issue. When the onboard tank valve is shut, the system is sealed. The question is will the onboard regulator be damaged if back fed. I already have a quick disconnect next to the onboard tank, just thought this might also be an option.
You appear to be the same person... not allowed to have two accounts.
 
Since you are wanting to put regulated pressure into the system against the output of the coach regulator, I suspect no harm to the built in regulator would be done.

You really should consider installing a "stay-a-while", "Sturgi-stay", or similar device to allow you to put high pressure LP into the system between your main tank shutoff and the coach regulator.

Doing what you want to do will require a non standard adapter to get pressure into the female fitting on the coach.

Charles
You have to be careful, though. If the port is after the regulator the line pressure is 0.5 PSI (11 inches water column). Some exterior regulators operate at higher pressures like 30 PSI then are further reduced at the destination to reduce line losses.
 

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