I had 2 valves on the gas manifold leak around the stems only when in the open position. Finally found it by taking the CO2 bottle, manifold and all of the gas lines to the kitchen sink and submerging the manifold and lines. Also had a CO2 tank with a valve that leaked around the stem when in the open position.
Just try to eliminate one thing at a time starting at the tank and working your way downstream.
You can eliminate everything but the kegs by disconnecting the them and opening the CO2 tank valve for just a second. Shut it off and watch for decaying pressure. Turn valves on and off while watching the pressure too. There's such small volume of gas in the lines, regulator and valves that even a very small leak will cause pressure to decay in a matter of seconds.
Use keg lube or other food grade grease liberally on the lids of kegs and crank the pressure up to at least 20 lbs. to be sure they seal well. Spraying Starsan or soapy water around the lid is a good check for that. With the keg pressurised, disconnect the couplers and spray around the poppets and posts. Leave them disconnected overnight and see if they are still pressurized in the morning. Also be sure that the O rings on the posts look good and are well lubed.
There's always a possibility that a line is leaking where it attaches to a fitting or has an abrasion that is leaking. It is rare, but the wall of the keg may be pitted and have a leak or worn disconnect is not sealing well. Again, a spray bottle of soapy water or Starsan.
Topic: Common Keg Leaks (Read 4188 times)
