fuel rail pressure to high

i have an 07 lmm dual cp3 new turbo suncost trans i put everything ppe makes for this truck on it titan 60gal tank banks brake top of the line  i have been gettting the poo88 code fuel rail pressure to high i belive its electric related maybe the relase value on the cp3 but i am not to sure any help is good help  

Hey bud, the pressure release valve is located on the rear of the driver's side fuel rail. I believe you removed it to install your dual fueler, secondary pump, fuel delivery line. It is possible a fuel surge is causing the rail pressure to spike and the rail pres. sensor is relaying this to the ECM. Having the abundance of fuel to the rail can some times cause a spike when not desired such as decelleration events, especially if you did not install a factory output CP3. Like one designes for high pressures. You really have no recourse if this is the case other than eliminating the code via EFI live. What you need to do, is monitor the raili pressure with a scan tool, see what desired pressure is and what actual pressure is. A significant difference will set a light.