Hey guys, having an issue with fuel pressure dropping at WOT. 2014 CTS-V ID1300s, DW-300 fuel pumps with the regulator that comes in the kit, (2 340lph pumps) currently 680 rwhp on E85. Vehicle had an issue with fuel pressure dropping on pump gas before the DW-300 pumps were installed, the fuel pumps were unknown at the time so i installed the DW-300 kit because my friend does not want anymore power than what its at.
I have noticed that as soon as the fuel pump duty cycle hits 100%, the fuel pressure goes to about 72 psi and it starts dropping from there, it drops to 38 psi by the time its at 6500 Rpm. I did adjust the duty cycle in the FPCM because the short term was adding, now its -3%. I tried changing max pressure regulation and a few other settings to see if that would change anything so in the log if you see that its commanding 85 psi that is why. The fuel system minimum voltage is 12.5 stock, but the FPCM voltage is at 12.0V, anyone ever try to command the alternator to put out more voltage to the fuel pump control module by changing the minimum voltage number? I have tried adjusting different parameters, but no changes. Any help is appreciated.