i don't think if it were 1/2 inch longer it wouldnt matter,you got an opening and an exit in the line they are the same size.you can only push an x amount of fluid through an opening as fast as it would be allowed.hydraulics is resistance to flow.we pressurize the tanks and I'm not sure but would assume 1 to 2 psi.so we have fuel line hydraulics or positive feed to the carburetor.i would plumb my fuel lines as neat as i can but honestly don't think if a line were slightly longer it would affect anything but ugliness....and replacing a pice of 2 inch fuel line every 10 or 12 flights isnt a bad idea....happy flying