The business end pipe/valve is attached to the tank 1/2 of the
way up (other end, when the tank is lying flat). This leads me to
a leap of logic. Since the idea is to burn a gasified vapor, the
amount of fuel I use 'must' be lower than the level of the outflow
pipe/valve. This is to avoid getting fluid fuel into the burner
system (does not sound good).
Liquid fuel must leave the tank to reach the coil at the burner in order to be come gasified. Same way a Coleman lantern or a gasoline blowtorch works.