this is kind of a two in one request so feel free to split it up. The main part: siphon physics for passive (pumpless) systems. there are some hose add-ons in the works that I'd like to function with gravity alone, and I'd like to move fluids through multiple tanks with suction and pressure.

the second part: individual pipe inventories. when a pipe section is filling I'd like it to actually contain the fluid and pull it from the tank as it fills the pipe run. if the pipe is broken the missing section could contain exactly 1 Bucket of the fluid and drop a source block