with the information provided, the only volume that can be calculated is the volume of metal used to make the tank.
If you have 10kg of steel (or 0.3 L of steel) you can use that steel to make a gas tank of any volume -

with 10kg of steel you can make:
- a small tank with thick walls (aka a lisa tank)
- a large tank with thin walls
- a huge tank with paper-thin walls (aka a ramen tank)

also the volume is dependent on the shape.
an empty cylindrical tank that weighs exactly the same as an empty spherical tank is going to be smaller than the spherical one, yet they weigh the same and use the same amount of material