Not really a question here just some info for my diesel brothers out there. I've had two F-550 with the 6.7 liters that came in the past few months with the code P0087 which is common, of course I went through the normal motions verified fuel filters were clean, base pressure at 62 psi while driving, fuel quality good with no debris found, no power balance or relative compression issues, the usual stuff right up to pin point test M16 where you disconnect the fuel line at rear of driver side fuel rail while commanding the fuel pressure and volume control valve. Found fuel flowing out so replaced the pressure control valve as per PCED, installed sensor, reset fuel tables, cleared code, and test drove 15 or so miles and verified repair. Or so I thought since the truck came back 150 miles later with vehicle in reduced power mode and code P0087 in memory once again, ran through same diag with the same results. Contact our all mighty Tech Hotline and was told to retorque fuel pressure control valve as per manuel. I can't lie I had no idea this spec existed or where it was (section 303-143, removal and instalation, under the exploded view secton). So I bought my over priced crows foot retorqued sensor, cleared code, cleared fuel tables, retested, and road tested 100 miles and verified repair. That truck has not been back since, we'll call that a win. However my next patient came in under the same circumstances and once again the pin point test lead to the fuel pressure control valve, replaced valve, cleared code, reset everything, and test drove truck 30 miles with no concern. 150 miles later truck was back with the same concern, same test results so I loosened and retorqued pressure control valve, reset everything, and drove truck 100 miles with no concerns. Released truck and what do you know 500 miles later here she comes again with of coarse the same issue. So at this point I contact tech hotline (it was that or take the old air hammer to the side of my head). Their response was interesting so I figured you guys would like to see it........
We have seen some issues where if fuse 33 in the BJB can be open causing the B+ on the IDS to show a over change and the one code that it seems to pick on is the p0087 code. We will want to check F33 in the BJB and make sure it is not open. If it is we will need to install the F33 fuse and retest. If the fuse F33 is not open then we will want to install the driver side fuel rail. We have seen some issues with the accumulator in the rail becoming loose and causing issues. This can also cause a p0087 code. This will come with a new PCV and FRP sensor. Even though the PCV is in the rail it is recommended to loosen and re-torque the PCV. This is because we have seen some issues out of the box with them not being torqued correctly.
Needless to say the fuse was ok and I have now ordered the needed parts to replace the driverside fuel rail and will let you know how it turns out, just thought it was interesting that even the fuel rails from the factory need to be retorqued. Hope this helps with your future headaches.
