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12-02-2024, 11:16 AM
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#1
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Member
Join Date: Jul 2023
Posts: 30
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LP gas freezing regulator
So I decided to get rid of using small Coleman bottles for my gas grill in favor of tapping the RVs 18 gallon tank. I got the splitter installed in front of the rvs regulator and run a 10 foot gas line to the grill when we reach our destination. What I am having an issue with is the grill starts up fine on high to warm up but after 15 minutes or so, the flame flickers and goes out. I discovered ice on the grill regulator so figuring that this is the cause.
Not sure why the grills regulator is freezing and have read that there might be water vapor on the tank. The last folks that filled the big tank said they did purge the tank so I am not sure how to correct this problem.? 🤔
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12-02-2024, 11:35 AM
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#2
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Senior Member
Join Date: Oct 2014
Posts: 8,799
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What PSI/column inches of water does your grill regulator put out to the grill?
Is it equal to or less than the 11 column inches of WC your RV regulator provides.
Said another way, would a tap AFTER the RV regulator provide sufficient pressure?
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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12-02-2024, 11:41 AM
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#3
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Senior Member
Join Date: Mar 2024
Location: Bohemia NY
Posts: 1,601
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What are you using for a splitter? Needs a system with a restriction and liquid propane should never make it to the hose or grill regulator.
__________________
Dennis
Bohemia NY
2008 Nimbus 342 SE Carlyle 
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12-02-2024, 12:30 PM
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#4
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Senior Member
Join Date: Jul 2014
Posts: 36,940
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Is the regulator drain hole pointing down ? Could have water in against the diaphragm.
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12-02-2024, 07:51 PM
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#5
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Member
Join Date: Jul 2023
Posts: 30
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Quote:
Originally Posted by wolfe10
What PSI/column inches of water does your grill regulator put out to the grill?
Is it equal to or less than the 11 column inches of WC your RV regulator provides.
Said another way, would a tap AFTER the RV regulator provide sufficient pressure?
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My grill is a basic portable Coleman Roadtrip 225. I will have check the specs on the regulator
Funny thing is sometimes it works fine for an entire evening, but flames been going out more frequently lately.
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12-02-2024, 07:56 PM
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#6
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Member
Join Date: Jul 2023
Posts: 30
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Quote:
Originally Posted by d23haynes57
What are you using for a splitter? Needs a system with a restriction and liquid propane should never make it to the hose or grill regulator.
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I picked up a basic 4 way splitter off Amazon. One goes to house, one goes to grill, and the 3rd goes to a 20 lb. Tank if I am at a CG and run out.
You mention liquid and yes, I did notice some liquid inside the hose connection to the regulator. Why there ?
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12-02-2024, 08:06 PM
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#7
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Member
Join Date: Jul 2023
Posts: 30
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Quote:
Originally Posted by twinboat
Is the regulator drain hole pointing down ? Could have water in against the diaphragm.
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I did not know about any drain hole so I will check that out in the am.
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12-02-2024, 09:20 PM
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#8
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Senior Member
Monaco Owners Club
Join Date: Jul 2017
Posts: 257
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You should T after the coach regulator with a shut off then plumb to the quick connect with another shut off. Take off the BBQ regulator and hook up straight to the bbq. Not as dangerous. That is why your regulator for the coach is at the tank, not as much pressure thru the lines and less chance of leaks. Be safe. You tubes will show how plumb to the bbq without the regulator at the bbq.
__________________
Diplomat Don and Debbie
2001 Diplomat sold, 2005 HR Imperial
2005 Chrysler PT Cruiser Turbo convertible
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12-03-2024, 08:51 AM
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#9
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Senior Member
Join Date: Oct 2014
Posts: 8,799
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Quote:
Originally Posted by DiplomatDon
You should T after the coach regulator with a shut off then plumb to the quick connect with another shut off. Take off the BBQ regulator and hook up straight to the bbq. Not as dangerous. That is why your regulator for the coach is at the tank, not as much pressure thru the lines and less chance of leaks. Be safe. You tubes will show how plumb to the bbq without the regulator at the bbq.
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Yes, coming off "after" the RV propane regulator is a good idea AS LONG AS YOUR GRILL IS DESIGNED TO WORK ON 11" WC or less.
If designed to work on lower PSI, come off the "after RV regulator" and leave the grill regulator in place.
If designed to work on higher PSI, tap come off the "before RV regulator" (vapor side).
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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12-03-2024, 09:08 AM
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#10
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Senior Member
Join Date: Nov 2018
Location: Beaver Dam, Wisconsin
Posts: 5,826
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As you can see from the above posts, it is complicated. It depends on individual component requirements.
You cannot just connect things and expect them to work. A grill with a regulator designed to work with the small bottles is not the same as is needed to connect to a big propane tank. It depends on liquid/gas interface and other things.
Often portable consumer gas appliances require a different regulator system to work with the big tanks. Check with a local propane supplier and repair service for proper equipment.
Symptoms:
Works sometimes
Frost on grill regulator
Probably getting liquid propane in the gas line. It is evaporating in the regulator causing significant drop in temperature.
Eventually liquid propane prevents the regulator from working because it is designed to work with gas, not liquid.
Most RV propane regulators are two stage systems. They draw gas from the top of the propane tank. Cooling occurs when gas evaporates in the tank. Tank gets cold.
First stage drops pressure a lot. Second stage provides precise 11" of water pressure.
In many RV systems, the first stage also insures that no liquid propane can get to the second stage of the regulator system.
__________________
Paul Bristol
Kodiak Cub 176RD
Nissan Pathfinder 2015
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12-03-2024, 09:08 AM
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#11
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Senior Member
Join Date: Mar 2024
Location: Bohemia NY
Posts: 1,601
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Quote:
Originally Posted by Joetiii
I picked up a basic 4 way splitter off Amazon. One goes to house, one goes to grill, and the 3rd goes to a 20 lb. Tank if I am at a CG and run out.
You mention liquid and yes, I did notice some liquid inside the hose connection to the regulator. Why there ?
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You want a proper fitting set up similar to this.
https://www.amazon.com/Marshall-Exce...s%2C110&sr=8-5
The restrictions in the hose fittings will ensure that any liquid will expand before reaching the regulator. Now, why is liquid making it to the discharge valve on the tank?
__________________
Dennis
Bohemia NY
2008 Nimbus 342 SE Carlyle
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12-03-2024, 09:30 AM
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#12
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Senior Member
Join Date: Nov 2018
Location: Fulda, MN
Posts: 1,687
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If he is connecting where the small bottles connect, then he needs to connect directly to the tank ahead of the regulator. The small propane bottles have the same pressure as the big propane tanks. If he is getting liquid, then he would most likely be getting liquid into the appliances in the camper. I have hooked two different campers to my grill before and I have not had a problem other than those Weber crappy regulator/control valve setups.
__________________
2000 Winnebago Adventurer 32v, P32 Workhorse
2005 Winnebago Adventurer 38J W24 Workhorse 8.1l, 5 Speed Allison MH2000
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12-03-2024, 11:11 AM
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#13
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Senior Member
Join Date: Jul 2014
Posts: 36,940
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Quote:
Originally Posted by Joetiii
I picked up a basic 4 way splitter off Amazon. One goes to house, one goes to grill, and the 3rd goes to a 20 lb. Tank if I am at a CG and run out.
You mention liquid and yes, I did notice some liquid inside the hose connection to the regulator. Why there ?
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You won't see liquid propane ! It boils into vapor at minus 44 degrees. You will only see vapor
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