Join Date: Mar 2006
Location: In a cardboard box by Alki beach.
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Sounds like the valve came apart, if I correctly understand your explanation. When you unsrew the tip, it is not supposed to come off, it should stay attached. If it comes off, you should just replace the tube.
And get yourself a decent floor pump. CO2 is meant for roadside emergency repairs, not pumping up your tire before a ride. If you use CO2 to repair a tire, it is usually recommended that you deflate it and refill with air later when you have the time.