Join Date: Feb 2009
Location: Durango, CO & Farmington, NM
WOT a lb7 lly will be 23,300psi
WOT a lbz lmm will be 26,600psi
At idle they are all around 5k i believe.
That is rail pressure, you wont get any fuel line pressure with out a lift pump.
A lift pump is good around 10-12psi at idle. Anymore than 14-16psi and it will cause the motor to lope=no good. At WOT you want atleast 4-6psi IMO or atleast a positive number.
With a heavy fueled 500hp tune you can drain the rails down to 10,000psi and the motor will spit and sputter. A lift pump will help maintain 21,000-26,000psi depending on your tune.
Last edited by nwtdiesel; 06-29-2009 at 06:47 PM.