I try to build a tower for fuel generators. I could get 4 generators at the bottom running. The fuel is inserted from the top and splitted 2 times to support the 4 generators. But now I would add another 4 generators on top of the existing 4.

But what ever I try, I don't get the fuel pump high enough. According to the height of a generator, the next floor is 4 walls above the current floor. If im right, this is 16 meters and pump mk II should pump 20 meters. But it doesn't work.

Has someone a idea?