Stove Fuel Transfer Thingy

[Mtnboy]

Heard mention on Kifarucast of some device that will transfer partly used fuel bottles into other partly used bottles??

Anybody know what they were talking about?

I have quite the collection of 1/2 to 1/3 full bottles just chilling.

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[Jordan]

Pretty sure it’s the G-Works Gas saver. Not sure what model he uses though.
Amazon.com : GAS Saver Plus / Lindal Valve Canister Shifter /Refill Adapter/ Air Vent Function : Sports & Outdoors

 

[flyinsquirel]

Yep, Gworks. Highly recomend a good scale to be sure how much gas you've added. An overfilled canister is dangerous.

 

[Paulyester]

How does it work, anyone know? My initial thoughts are that if you have two half full canisters, nothing would transfer between the two. Or worse, you have to a 1/2 full canister and a 1/4 full one, you hook them together and now you have two 1/3ish full canisters?

 

[Paulyester]

Just watched a YouTube on it, apparently you need to cool the receiving can and warm the donor can so that you have unequal pressures.

 

[pods8 (Rugged Stitching)]

Those stove containisters are mostly liquid fuel with a flammable vapor comprising the rest of the space. The one container is upside down so anything that comes out of it is the liquid phase. The device has a bleed valve to release some of the vapor in the container being refilled which will decrease the pressure and allow liquid to flow in. In addition is you chill the container being refilled in the freezer it will decrease the pressure in the contain off the bat to make room for liquid to flow in from the warm canister. I presume this is why folks say weight carefully because if you get too much liquid full in there it could over pressurize the container if the container is sitting in the sun or such and the pressure increases in it.

 

[pods8 (Rugged Stitching)]

I got curious and was doing some more reading on this thing, one caution is you might run into issues with transferring one partial into another partial is the propane ratio might degrade. In cold weather more of the propane gets burnt leaving behind the butane variants which transition to vapor at higher temps making them harder to burn, esp. in the cold if using an upright stove that uses the gas in the canister (vs. inverted which draws off the liquid). So you might end up with some full but difficult to burn canisters esp. if your stove requires higher gas pressures and experiences performance issues in the cold normally.

The idea had me intrigued but I think I'll stick to either fresh containers on weight/space critical trips or just carry along an extra canister while I use the end of one on other trips (few ounces extra weight). I weigh canisters after trips and note how much gas is left in them with a sharpie on the bottom, there are alot of shorter trips that partial containers would serve just fine if you know how much is in them and get a feel for how much fuel a trip typically uses (not that much in reality).

 

[Mtnboy]

Appreciate all the info fellas, but I think I'm with pods8, seems like a lot of trouble/potential risk.

I'll just stick with new canisters and save my partial ones for car camping.

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[pods8 (Rugged Stitching)]

Keep in mind there are degrees of partial containers, you can easily weigh them after trips (they typically list the container empty weight) which also gives you a good idea on how much fuel you actually use on a trip. If you're going out for a trip you'll only be boiling up a few pots of water it doesn't take much fuel. Point being is the partial canisters don't need to just stack up for car camping. Heck we're not ultra light thru hiking stuff, when out on a recreational or scouting trip go ahead and grab a couple 1/3 full containers and use them up. You're not carrying in a bow/rifle which more than makes up the extra few ounces of canister.