Ok, I had some people asking me how I was going to make my CO2 tank useable both standing up or laying down. It is done and working. Here is the write-up. As always these are all in my build thread but I know most dont follow that and I thought this might be usefull to others who may not see it there so here it is.
I wanted to leave my CO2 tank strapped to the back without having to pull it around to each tire to fill them up. Since the coil hose I went with would stretch past the front of the jeep from the back the hose was not the limiting factor but instead the inherent nature of liquid CO2 in a tank. You simply cannot lay a standard CO2 tank on it's side and use it for this purpose. You would be dispensing liquid CO2 into your tires instead of gas, not good. So time to use that thing on my shoulders my dad always said was not just for holding my ears up.....
I did however also want to be able to unstrap the tank to take it out and use it vertical to air up someone else's tires or for other purposes. I designed a tube that would allow me to use my tank both standing up or laying down and supply CO2 gas in either position.
Problem solved. Here is exactly how I did this for just a few dollars.
When using a CO2 tank for airing up tires you want to use the CO2 in the gas state which is always at the highest part of the tank not the liquid. Since I want to use my tank in the horizontal and vertical positions and draw from the gaseous area inside the tank I needed to make an internal tube that will do this.
I did a bit of research and found that a CO2 cylinder with a full fill contains only 3/4 of its volume as CO2 in the liquid state. So, there it is. I just needed to be able to draw from the top 1/4 of the tank in two positions. Here is what I came up with.
This will work as long as you know which way is up for the tube when the tank is horizontal. To do this all you need to do is mark this relationship on the valve and position this as up when the tank is laying down. Here is what I used and how I made the tube.
First you have to make sure the tank is EMPTY!!!! You have to remove the valve from the tank so open the valve all the way up after it is empty to make sure there is no pressure inside the tank while you are unscrewing the valve. This valve will be a bear to remove. It will more than likely have loctite on the threads so eat your wheaties before putting a wrench on this thing. I tried several different methods of breaking the valve loose and this one worked like a champ.
Find a solid/fixed object to strap the tank to. I used a car hauler ratchet strap and ran it around a 4x4 post on my deck and tightened it down as much as it would go. I also placed a piece of 2x4 behind the ratchet to keep from scratching the paint on the tank.
I then took a big crescent wrench and tightened it all the way down on to the valve body. Went and got my handy cheater pipe to get some more leverage and pulled. It broke loose right away and then the valve just unscrewed with ease. It has standard threads so loosen as normal, counter-clockwise.
As you can see below. The inside of the valve body has threads so this will be easy now.
Here are the supplies you will need:
1/4 OD Soft Copper Tubing
1/4 OD x 1/4 MIP Brass Compression Fitting
Thread Seal Tape
4 PK Guinness
Here is what the packaging looked like from Lowe's