Join Date: Jun 2017
Feedback Score: 0 reviews
HELP! P0087 Code, 6.4L, replaced everything!
I have a 2008 F250 with the 6.4L diesel. The truck stumbles on takeoff at about 20mph. It will completely cut out and rail pressure will drop. If I stay on the pedal, it will take a few seconds that it kicks back in like normal. I am receiving code P0087 for low rail pressure. 90 percent of time it lacks power. Rail pressure will only hit 19,000psi at WOT. But sometimes it will have full power and hits 25,000psi easily. I have replaced everything on the truck. The tank has been dropped and cleaned, pickup tube has been inspected, HFCM has been changed, both fuel filters, HPFP has been changed 3 times, injectors & jumper tubes, HPFP gasket, HPFP hard lines, HPFP harness (short harness under the heat shield), and the rail pressure sensor. All parts used are known good parts. No contamination has been found in the fuel system. There is no air intrustion. When the problem started, the truck wasn't deleted but it is now. It was deleted when the first HPFP was changed. Occasionally it will throw a P2291 code also.
Thanks in advance for the help!