Abstract: A reservoir for a gaseous combustible stored as a liquid has a substantially closed container having a side wall, an upper wall, and a bottom wall, the upper wall is formed with an outlet port. A porous mass generally fills the container and is saturated with a body of the combustible in liquid condition. A dip tube has an upper end joined to the upper wall at the outlet and a lower end formed with at least one orifice of such small size that a meniscus/interface is formed between the liquid and gaseous phases at the orifice. The tube is formed with a crosswise web at its lower end and the orifice is above this web on a side of the tube. Furthermore the container is generally cylindrical and centered on an axis, the outlet and tube is coaxial with the container.