Leaky Dash Tractor valve?

Ace had all the parts. Now to see if I can reassemble them w/o air leaks..

 

Allright - that fixed it. I put the whole thing together and even after making it more than snug ("pssst" sound out the fitting) - so I gave it a 1/4 turn. Then a bit more...and more and the "pssst" started to get less until "PSSSTSTOP". And that was it. I gave it 1/8 turn more for good measure. Fired it up and water/soap tested GOOD.

Not sure if I should leave it this way now or opt to replace the fitting with a quick disconnect thing from Fastenal.....if I replace the fitting, I likely will replace all of them just for good measure. But right now, all of the 5 hoses and fittings at the back of the combination valve are air tight to the best of my testing and hearing.

I am sure none of the hardware I used is DOT compatible, but not sure what the difference really could be here. Brass is brass. It works and there are NO leaks at all.....not sure how they can make a fitting much different than what I used here..

EDIT: Well gee...it worked ok for awhile...I got fuel, released the tractor brakes, heard air hissing again - BROWN Air tube.
Got to my storage yard and tried it again - now it doesnt leak that I can tell.

I am going to get the quick-fasteners and be done with this issue once and for all.

 

I know...but earlier in this thread, I narrowed it down to the valve. Replaced the valve, fixed one issue but created a new one.

Brown hose leaks at the fitting....

..this is not to say I might not have other issues still, but when I have an air leak at a connection, I need that fixed before continuing troubleshooting.

 

I used tape on the threads...Hmm. If I redo this, I can easily remove that. I wrapped them very well - but your comment makes sense too......