[Carnut427]

I don't know if you've got a baffled tank or not, but mine was built in '94, was roadracing at the time and it would starve for fuel on left turns because the pickup was on the left side and the fuel was on the right side of the tank because of centrifugal force. I solved the problem by installng a second pickup on the right side with a separate filter and electric pump for each, installed just behind the cockpit, ahead of the rear end. From there they converge into a 1/2" dia aluminum line up to another filter on the front of the engine. As mentioned by others, I'm not sure if the large size is really needed, I did what I did for another reason (other than the 1/2" dia aluminum line) and it works. By the way, any air picked up by the fuel pump that's uncovered comes out the carb vents. No problems whatsoever.
Dan