What should be done if a fuel gas cylinder has a leak?

If, when the valve on a fuel gas cylinder is opened, there is found to be a leak around the valve stem, close the valve and tighten the gland nut. If this action does not stop the leak, discontinue the use of the cylinder, and properly tag and remove it from the work area.

In the event that fuel gas should leak from the cylinder valve, rather than from the valve stem (and the gas cannot be shut off), tag and remove the cylinder from the work area. If a regulator attached to a cylinder valve will effectively stop a leak through the valve seat, the cylinder need not be removed from the work area.