Nitros get fuel pressure by tapping the exhaust and running a line into the fuel tank. This has the advantage of automatically matching fuel pressure to desired fuel flow - when you open the throttle up, exhaust pressure rises, so fuel pressure does as well. The engine "feeds" itself when it...
I've seen it done, both as pictured with the fuel tanks inline, and in parallel with Y-connectors. I think inline would affect your tuning by delaying the response between exhaust pressure and fuel flow; it'd be like having 40 feet of tubing between the exhaust and the fuel tank.
I've also seen...