Before I start, I have to say that I am completely aware of the fact that what I am doing is not the most efficient way of getting into space. I'm fairly new to the game, and I seem to have misinterpreted the way fuel lines (FTX-2) work. I needed to create a lot of thrust, and needed a lot of fuel, for a traditionally-staged (non-asparagus) heavy lifter. So I packed a lot of large orange tanks into a shape I was happy with and towered them 3 high, giving some towers 2.5 tanks to fine tune the wet mass of the stage. Each tower terminates with a Mainsail with a sprinkling of other thrusters added in balanced formations to fine tune the thrust. The whole thing is balanced on the launchpad. However, each tower obviously drains at a slightly different rate, so it was in my interest to "pool" the fuel - to treat the many tanks as one big tank so that the whole thing burns evenly and the stage runs out of fuel predictably. What I tried to do was use fuel ducts heading in both directions between neighboring tanks, such that every tank was in some way connected to every other tank. As you probably know, having more experience, this failed and the thing shredded as certain areas drained faster. Is there an easy way to pool all this fuel? Am I doing it right but missing a connection somewhere? Or will engines always just try to pull from the farthest tank?