as i know the fuel pump is 2.55 liter per Hour.it give more fuel supply to your engine compare to your stock fuel pump.when your car perform the mode will go high, when normal drive it will go to low mode.
Recently have had to work on GTR at home which is something I haven't done regularly in awhile. Other than swapping out dead batteries, the last thing I did was probably short shifter install years ago. Anyway...