I don't know about any good article on setting up a CO2 system, but I can say you very likely have a leak. When I first set up my CO2 system I thought hard about leaks and the first realization I came to was that it only takes a tiny, tiny leak to deplete the supply in a few days. We use mere bubbles per second of CO2 - put soap solution on the end of the CO2 line and you should see a few bubbles per second soap bubbles form. So, the leaks we are looking for are likely to also be that small or smaller. This means to me that I need to soak every single joint in the system with soap solution, similar to that used for children's bubble blowing games, and look for an accumulation of bubbles over several minutes. Once I realized that I found several leaks in my setup. Fixing most leaks just means tightening the connection better.
My Milwaukee Regulator came with a bubble counter, and it leaked at the base from the first day I installed it. I eventually just scrapped the bubble counter. Then, later I found that I had to retighten the regulator to CO2 tank connection a few times after installing it to stop leaks there. I'm still not sure all of the leaks are gone.
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hoppy

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