I dunno. If you accelerate that mass of fuel forward, seems to me it makes no difference whether you have a conventional pickup or that setup - the center of mass of the fuel is in the same place, and the fuel flows from the same point A to B - same elevation change and any surge from head pressure ought to be the same IMHO. I think the path it has to take is academic, except for the additional drag/pressure drop caused by longer tubing. Yes you get pressure drop over a long thin tube - meaning suction will be hampered the longer the line is. And it is not great to begin with. I have had pretty steady engine runs using crankcase pressure on high performance .049 RC models, but not with a reedie, you have some technical challenges there.