Rubbish.

The centerline level helps prevent siphoning while the engine is on the ground but once the engine is running it has almost NO effect.

Otherwise we would have major issues when our planes fly inverted, do up-lines or down-lines. In each case the fuel level is much much higher or lower while the plane is performing manouvers.

Those who tell you that the centerline is critical, either do not have their plumbing set up properly, or simply don't know how to tune their engines.