Actually, you can do it either way and it won't matter. The attached picture is how it looks fresh from the factory. You will noticed that the line is straight, but it doesn't touch the side of the motor even if it is straight. Even if it does touch the motor, there isn't enough movement of the fuel line itself to cause any problems with rubbing. On OS motors with a remote needle valve there is a slight delay in the motor changing when you make adjustments of the needle valve, and if you increase the length of this line that delay will increase slightly.

But as I said before, you can do it either way with no problems at all.

Hope this helps.

Ken