Yeah it gets turned off after each use, it just seems like the last bottle i used went WAY too fast. I normally run about 20CFH and the last one didnt seem to last more than maybe 2 hours worth of welding.
Im getting it filled tomarrow...guess i should check for leaks.
when you get it back take a cup of dawn or other type of dishwashing soap and a cup o water. Mix the two and spray the whole valve down... If it's leaking you'll know...
Then do all the fittings on your regulator and lines.. You might find something there!