I broke the flange that the remote needle is attached to on an OS46FX. I Bench ran the engine after the crash with about 6" of fuel line between the very remote needle and the carb.

I beieve that the remote needle is sensitive to vertical displacement from the carb. The further away it is, the more it will be above / below the carb at some point in a loop.

My bench run did nothing to help test that.

Anyways, I can vouch that the pure length can be more than the basic 1.5".

gus