Agreed! Ditch those plastic clamps, cut 1" off each line and re-secure with proper Oetiker clamps. I can't tell you how many leaks I've seen with those quick snap clamps, they are acceptable for short term usage on low pressure beer line for DD systems in a pinch, but almost always lead to slow leaks when used to secure gas line.
Also want to second Scott's method, shutting off the tank and observing the high side pressure gauge is the key to finding system leaks, and is why it is always recommended that you have a proper shutoff for every individual line in the system. It is MUCH easier to diagnose a leaky keg coupler barb connection or sealing washer when you can narrow it down to WHICH keg it is by shutting off all the valves and opening each while watching the high pressure side with the tank off. This also allows you to pour and run your system even in catastrophic failure by isolating any problem lines.
Good luck
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