As stated. In my case, I use 4 Fluid gates to gate the input of one layer of space pipe to an other space pipe. (In the image, there are 7 full 3 layer inputs of which only one is on at a time, one per color and only one full 3 layer output.)
The issue is that the input is stagnating and the output is undersupplied. but I use one gate per fluid thrower on one side.
The wire logic is correct, I checked that already
Or could it be that space pipes are faster than the fluid throwers can do?