[Chris Williams]

I use liquid sealant on the threaded connections. Used to use tape, a friend told me he prefers the liquid. Seems easier to know you're doing it right. Don't need a lot.

The push connectors on the flex line can be bad, and they are cheap (Jegs or Summit has them) so replace them if they are the least bit suspect.

Buy a bottle of leak detector at the hardware store (in the heating aisle or near the gas line fittings), it's cheap and is way more "frothy" than any home-made solution I've ever made. Go over the whole thing, I guarantee there's a small leak somewhere.

I went the extra mile and put on one of the Dedenbear inline solenoids that only turns the CO2 on when the ignition is on. Not cheap, but haven't had a "dammit the bottle's dead" run (like we had at a national event last year) since.

HTH,
Chris