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My 5lb co2 tank ran out after 2 uses. The 1/6 keg didn't even get kicked. Do u i need to turn the shut off to off to stop flow of co2 so it doesn't run out? Or do I have a leak?

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You have a leak. As long as your connections and lines and kegs are sealed up tight, you don't have to turn off the main valve because there's nowhere for the gas to go. You can spray Star San (or other bubbly liquid) on the various seals to check for leaks.

Having lost a 10 lb. tank of CO2 to a leak myself, I always turn off my main valve when I'm not serving beer. This helps me to identify leaks that I couldn't find otherwise (e.g. a leaky post O-ring) because the pressure in my regulator will drop as the gas leaks out. If I turn on the gas and hear a significant amount flowing into the kegs then I know I have a leak somewhere.

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It sounds like you had a small leak in your second keg. When you've gotten your CO2 refilled, take everything and submerse it in water. Watch for bubbles and tighten that connection. Your most likely culprit is the seal on the keg. Make sure that the O-rings are good and that they are lubed.

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    Everything except the regulator can be submerged for a leak check. – Evil Zymurgist Mar 4 '16 at 14:30
  • I dunked mine straight in when I had a leak and had no problems (you have to let it drain completely) – CharlieHorse Mar 4 '16 at 17:19
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    gauges are not water tight, and the coil springs inside are very susceptible to corrosion. Making a stuck needle or rendering it inaccurate at least. – Evil Zymurgist Mar 4 '16 at 18:20
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The most common culprit is a bad oring on the keg or a worn ball / pin lock attachment.

If you hear gas when rocking or turning a lock, it can't be trusted.

If your regulator attached to the co2 tank with a crush gasket not an oring, these are a one time use and need replaced once the seat has been broken. Because they form into the micro imperfections of the tank and regulator and then retain the impressions causing leaks if reused. Crush types are either paper or hard plastic, they say the plastic can be reused but I've not had much success so I changed to nitril orings.

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