Im honestly surprised the stock lines can keep up with as much power as Rob was pushing through them.(or flow)
see that's the thing...they weren't keeping up---not with acceptable
pressure drop. Rob had to go to dual fuel pumps to get the flow where it needed to be AND not lose so much pressure that it affected the pressure at the rails.
To illustrate what I'm saying:
The BSFC of a supercharged engine can be approximated at 0.6 lb/(HP*hr).
255L of fuel has a mass of approx: 255L * 1gal/3.79L * 6.18 lb/gal= 415.8 lbs
415.8lb/hr /[0.6 lb/(HP*hr)]= 693 HP
Thats how much a single 255lph pump can support at the crank (BHP). Now of course it has to push fuel all the way to the front and up past the fuel filter, so even taking this into account, I'd say a 255lph can support 650BHP---again, this is IF you have no losses due to pressure drops along the way.
A single 405lph will support ~ 1100 BHP. DUAL 405s could support ~2200HP. To need to go that
overboard just to get sub-1000 HP levels is an indication of obstruction somewhere down the line.
Just my 2cents, but what do I know, my car doesn't even run. LOL