hey people hows it going?

i got a 2005 5.9ho that has a big prob.lol
this thing has no power, the rail pressure is very low.
took it to the dealer and was told the high pressure pump was shot.
i changed the pump and it never helped out a thing. im not getting any codes or anything, can someone give me afew ideas on what you think is wrong?
ive changed fuel filters and the fca as well.

thanks

 

check the flowback on your injectors...when you unplug your FCA at IDLE do you get pressure rattle? mileage on truck? fuel psi to cp3?

 

fuel return valve. (fpr)
sounds like its shot.

 

pull the pressure limiting valve which is right next to the rail pressure sensor on the common rail these tend to have some problems i have a set screw in mine completely blocking it off and my rail pressure is fine.