No matter if I use one stack , two stacks, 3 stacks or 4 stacks the outcome is the same. I have use twig, wood, stone and HQ for the pipes. The numbers are exactly the same. The only stack limit that can be changed is the refinery. There is no option on the pump outlet or the pump fuel tank, mind you that is not going to be an issue unless either one is full, I believe.
I am not complaining, I am just looking for other ideas, I have worked many hrs to figure this out and have tried every cobination that I can think of. Every time I lose 480LG/hr when piping back into the pump fuel tank