2008 LMM 4500 dump truck, took ther DPF off about a year ago, I just went in and shut off the DPF/EGR truck ran fine for almost a year, now it is popping the low rail pressure code P0087. I ramped the rail pressure up at an idle it holds just fine, also checked balance rates they are also fine. What could be causing this issue?? I told him to change his fuel filter and let me know. I logged it yesterday and got it to act up.
