The pumps that I am using work off of the crank case pressure. So in theory, they should pump fuel every revolution and not be dependent on the vibrations. Removing the pumps and going to pressure could help with the header tanks.

I have the tank right on the CG and almost at the high point of the fuse and actually even with the carbs if not a bit higher.

I am already at 26 pounds and 28 pounds wet. If I move the tank back to get them closer to the motors, then I will need to add even more weight. Moving 2 pounds of fuel behind the CG will force me to add another pound or two to the nose where I already have a little over three pounds.

I am using short pipes that I got from Dub Jett and they do have a pressure nipple available already drilled.

Well, I really do appreciate the help. I will look into seeing what I can do and if it will work for me.

Andrew