This fluid dynamics thing is not that easy to understand < at least not to me> you guys are saying that the dia of the line does not make a difference psi, so a 1" pipe that is 100ft tall will take the same energy to lift as a 2" pipe 100ft tall, but what about the amount < volume> of liquid coming out the end? If ya read all the fuel pump guys versions for the need of a larger fuel system it kinda makes sense, can some one link together both pressure and volume as related to a racing fuel system? As is, it seems to me that a small pump with a large hose should work for the most part, so why are we buying large pumps? I started out with 2 Holley reds with 2 3/8 fuel lines feeding a 850 dp Holley and just about every one busted my chops about it