Ok, so recently I converted a Danby commercial kegerator to accept both pin lock and commercial kegs. All seems to be working perfectly, EXCEPT I keep running out of CO2. I got a new CO2 tank filled on Friday, drank a couple beers on Friday night, and the tank is empty today. Not to mention this tank was an exchange for a similar situation which happened the week before. Picked up a new tank on Mon., by Fri. tank was empty. When I got home and connected my tank this is what the tank read. I called the store when it said only 40% but they explained that is what it should read? Not sure if I have a leak, or where the CO2 is going? But I need to get to the bottom of this. Any suggestions?