No air in WET tank and losing air when driving

So I changed all my tank fittings and another fitting on the turbo control box because they were leaking and everything is fine until I start driving to get loaded. After I drove 25 miles I noticed my "F" gauge losing air faster than my "R" gauge. I pulled over and listened for any leaks and could not find anything on the tanks or around the truck. Get to the loading place and get under the truck to check for leaks with soapy water. The check valve on one of the tanks was creating bubbles but nothing horrible.

I also checked if I had air in tanks. I had air in both primary and secondary tanks but no air in the supply tank. Is that normal? It has air while compressor is pumping but as soon as it sneezes the air disappears and I don't know where? Btw, both tanks hold air fine when I'm parked.

Please HELP!

 

I wonder why it started doing it right after I replaced my tank fittings and a couple other small air leaks.

 

I just went under the truck while it was pumping air. After it sneezed the air kept leaking out from the release valve thing so I think that might be the issue.

 

I'll try brake parts cleaner but I did just pick up a new air dryer. I don't have time to rebuild it since I'm already loaded and need to hit the road soon

 

Just changed the air dryer. SAME PROBLEM!