Steve,
I (think) I understand your logic, and I have made the same mistake myself, imagining interactions where there is not, and missing the real one(s). I wasted lots of time moving the remote valve around, just to find out that it does not matter.
But in this kind of experimental work also no result is a result, you have to walk that road.
Where the fuel line goes between pick-up point and spraybar, does not matter. Also the inflow vent inlet, it is filled with air so there is not much of a fuel head to talk about. L