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Old 02-03-2013, 06:09 PM   #1
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Auxilary propane tank

Is it possible to attach a second propane tank to the remote fill? I am familiar with the products that attach near the main tank regulator. Just looking for an easier alternative because our tank is not easily accessed, it requires crawling under the bus.
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Old 02-03-2013, 07:13 PM   #2
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Yes it can be done though you will have to buy the correct propane fittings and of coarse check for leaks. My suggestion is check with a local gas grill place. Some can make up custom hoses etc.
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Old 02-03-2013, 07:23 PM   #3
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I do understand I can fill the main tank with another tank, until the two tanks equalize, still leaving liquid in the aux tank, but can I leave them hooked up and run everything.
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Old 02-03-2013, 09:54 PM   #4
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Quote:
Originally Posted by Erlingiii View Post
I do understand I can fill the main tank with another tank, until the two tanks equalize, still leaving liquid in the aux tank, but can I leave them hooked up and run everything.
The only way you can fill from another tank is if that tank is higher
than the main tank and turned upside down other wise all you will
put in the main tank is vapor.
Also if your main tank has the now standard automatic shut off fill
valve you will not even get that into the main tank.
If you contact a propane full service shop they can assist you in what
you will need.
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Old 02-03-2013, 10:36 PM   #5
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Quote:
Originally Posted by wb7auk

The only way you can fill from another tank is if that tank is higher
than the main tank and turned upside down other wise all you will
put in the main tank is vapor.
Also if your main tank has the now standard automatic shut off fill
valve you will not even get that into the main tank.
If you contact a propane full service shop they can assist you in what
you will need.
Correct me if I'm wrong but, I was under the impression a propane tank fed from the bottom of the tank, therefore turning it upside down would not be beneficial. And gravity is not a factor due to the fact that it is a pressure based concept(propane is a gas at stp)

My coach is an 06 and has a manual shut off switch next to the remote fill.

I am very frustrated because my 33g tank(27g @ 80%) only lasts me a week or so. The cg I'm staying at offers a 500# pig they will install at $4 a gallon(rip off), so for about 500 bucks I don't have to clean my counter tops off, pack up and unhook every week. They also told me they don't want random propane tanks sitting out, ie they want the profit from their price gouging.

I have filled a 1# tank from a grill tank(theoretically not full), therefore a full 7 gal tank has a higher pressure than a nearly empty 30 gal tank, so the liquid will flow into the less pressurized tank until the two tanks are equal pressure. Fill the 7gal and repeat, granted I will never actually fill the larger tank, but it should keep me from the hassle of moving the mh not to mention the outrageous prices they want to charge.

I can go to a uhaul and get propane for aroun 2.50/g, how can they charge $4? Does propane fall under a deferent fuel category that is not regulated, even gas stations have a small window they can deviate from the market price based on fed regulations.
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Old 02-04-2013, 12:10 AM   #6
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I bought an adapter hose with screw in end for a 7 gal tank, other end has an adapter for the refill port. $40.00 I turn tank upside and open tank valve,open vent for a few seconds, liquid goes to main tank ,usually in one day. $1.99 gal here in Az. Trip to Wally with propane station on the way once a week keeps me 3/4 full.
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Old 02-04-2013, 12:27 AM   #7
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I'm gathering you don't like the Extend-a-Stay type fittings which allow you to do anything you want to do.
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Old 02-04-2013, 06:33 AM   #8
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There are two types of tank feed, vapor and liquid.
Some engine and the such require a liquid feed to their fuel systems and tanks used
to fill from also use a liquid feed.
The tanks most commonly used are a vapor feed from the top of the tank.
As you deduce the pressure in the tank the liquid left in the tank turns to vapor, this
occurs as you use the vapor.
The only way to turn vapor into liquid is by greater pressure/ and temp.
Therefore you have to use gravity to transfer the liquid from one tank to the other.
And if both tanks have liquid in them and the outside temp is equal the pressure in
both tanks will be very close to the same regardless of how many gallons of liquid are in the tanks.
The most common way to use two tanks is put a T connection with the proper
connection just in front of your regulator so you can switch tanks.
As a side note with this type of connection it is possible to back feed liquid by pressure pump or gravity but make sure you are not using propane to avoid getting
liquid into the regulator.
It sounds like your cg,s deal is a propane and tank rent type of thing and I agree
a little on the steep side.
I wonder if they allow you to rent a tank other than their's where you might find a
better cost deal?
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Old 02-04-2013, 10:49 AM   #9
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My main tank and plumbing are in between the frame rails,so I use the refill port,with a warmer auxillary tank (sunshine for a couple hours) upside down.
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