the seals in your regulator are bad.take a full tank of co2,hook the regulator up like it was ready 2 run.instead of pluging it into a timer plug it right into the wall.listen and feel for any leaks.there really easy 2 take apart and repair.if i remeber right u want to buy polyurethane o rings if u need to.go to a co2 shop and ask them what kind rings they.those are the ones u want.