Some questions:
<Where does the working fluid go after firing?
<<If it's drained after every shot, how does it stay wet when shots might be separated by hours or days? How do you make sure only the gas escapes and not the freshly supplied liquid from the tank?
<<If it's not automatically drained, how do you deal with the hot, gaseous working fluid left after each shot? How do you not oversaturate the chamber? Is the operator expected to drain it every so often or does it stay there until the whole gun can be field stripped and cleaned?
<Do you keep the tank side pressurized?
<<If so, where is the pressure vessel and what pressure is it at?
<<If not, how do you utilize that small bit of gas to draw fluid from the tank?
<What happens if the tube gets caught on something and dislodges or gets split open?
<Extremely quiet suppressed pistols that don't need these support systems already exist, so how does your solution improve on existing solutions? Larger caliber, can be applied to most firearms, longer time without maintenance, longer lifetime, etc.