I searched, but didn't find an answer. What kind of rail pressures should I be seeing? At idle? Cruising down the road? WOT? My truck is 04.5 with +50HP injectors and a ts performance MP-8 pressure box. I do have a rail pressure guage also.
Thanks,
Mike

 

With the 3rd. gen Dodge Cummins 03 to 07 with the Bosch common rail system should not exceed past 27,000 ksi that's all your stock fuel rail can hadle.Unless you get your rail modified,anything past that can cause damage to your valve relief,leaks from the fuel rail pressure senser,harm to injectors,and of course replacing another fuel rail.I use to have an 03 5.9 Cummins,but now have a 08 6.7 Cummins with modifications done.I can easily get to 28,000 ksi ,but the 6.7's have bigger fuel capacities bigger fuel lines,rail,injectors,and so on.You can see pictures of the truck under post Cummins or Gasser,take care and hope this helps!