It's not something you really want to guess, if it's wrong then you'll kill the engine. Somewhere in the region of 3.1BAR could be close, but it'll depend on the type of FCD your using and what you have it set to.
Im new here. Im running a 4efte, 315 injectors, walbro 255 pump and hks gt2530r.
For 1.4 bar (stock map) i run 90 lbs of fuel and a AFR of 11.5 and around 800 C°
Im at the limit.