Air Line Fitting Removal

[Rustygold]

I have developed a small air leak in a air line located on the firewall. I believe there is enough hose to reattach it to the original fitting without buying a new hose.
I can't figure out how to remove the line from the brass fitting so I can cut line and re-attach.

[jacwjames]

Not sure but it almost looks like this is a push/lock type fitting almost like a sharkbite. Try pushing the end in and see if you can pull the hose out.

[BonS]

Push the brass ring toward the brass body while pulling on the hose. This is easy without air pressure in the line. Hard or impossible if there is air pressure. Cut off any hose that has a dimple from being previously inserted. Check for air leaks after refitting. Sometimes the o-ring inside the fitting is shot and the fitting needs replacement. Good luck!

[Happycarz]

As stated above push release ring toward fitting body, so there is no gap between release ring and red arrow.
Try using an open end wrench over the tubing to push against the release ring. Then push the hose in, before trying to pulling it out.
Cut 1/4” off end of tubing, wipe off end of tubing, making sure all traces of dirt and any paint are removed from tubing.
Reinsert tubing into fitting, while release ring is back toward its normal position. Push it in until it stops. Marking the tubing a 1/2” from end with a Sharpie will help you see how far you have pushed in the tubing. Once it is in all the way, pull outward on tubing to engage the O ring around the tubing

Dirt will get between ring and tubing, chafing the tubing. And with constant pressure on the tubing at the O ring, the tubing will have a slight indentation where mating to that O ring. Most of the time, a clean smooth section of tubing is all that is needed to eliminate the air leak

Finally air up system and spray with soapy water to verify fix.
I hope it as simple as this to fix that air leak.

[Outbound]

Ditto