Hello! Brand new to the forum. Any help would be great! I have a 2005 F350 6.0l and can not get started after replacing injectors and both fuel filters. I had both oil rails off. I have bench tested the ipr previous. I have my scan tool plugged in and reading only 5-10 psi injector control pressure while cranking. Both batteries are fully charged and quite new. Also, i tryed unplugging the injector pressure sensor and tried to start. Scan tool then read 0psi while cranking but no start. I know the air needs to bleed out before pressure build up. How much cranking does it need? I have exhausted both batteries 3 times now. I did have a hard start previous.
Any help or insight would be greatly appreciated!

 

They can be a pain in the ***, but here's a trick that I do, but I hope you are certain that the IPr is functioning properly too, some would just replace it. Can you see also the IPr percentage on your scan tool? It's got to be atleast 70%, if so, IPr is good, lower then that or nothing may be shot, but check the wires and the harnest too though. Had this problem and was the dumb harnest wire that were shorting together.

But as you say air is trapped in there, so this trick is to open the IPr at wide open throttle. So I don't know if you can get a hold of a IPr harnest. It's the same as the turbo harness. At the dealer you can just buy the harness itself, but can't garentee they have it in stock, might have to order. Or just go to a wreck yard and take one from a truck.
What you do is, unplug the IPr plug off, then with the other harness you got( you may need to lengthen the wires to reach the battery) you hot wire the IPr straight to the battery. One wire to negative the other to the positive. But this case you need to be 2 people, one at the ignition and other at the battery with the wires in his/her hands. Once the one at ignition cranks the other puts the wires on the battery, as you crank for a few sec even sometimes for even just 3 secs (get one to watch the icp pressure it should build up fast)and the truck fires up, the person at the ignition shuts it off right away and the other with the wires pull away from the batt (leave the wires on to long can kill the IPr). This has worked for me, and if this doesn't work, your IPr maybe shot or you got a major leak in the system.

 

Thanks for your idea! Makes sense and will consider giving it a shot. I had the turbo off when doing the injectors. I removed the ipr and bench tested it with shop air and a 12v bat. It functioned fine. Harness could be suspect. How about disconnecting the plug and testing voltage on the plug? I Should get around 12v with ignition on and if not may have a short? I also have 48v at the ficm and egr delete I should mention.

 

Yeah if your tool can see the IPr percentage, then test the harnest with the key on should do the trick

Here a quote about the IPr voltage:

(((To be a little more exact, The IPR is powered by the VPWR circuit which means it is supplied battery voltage at all times. Being an output device it is actuated by controlling the ground side circuit and as mentioned, by pulse-width modulation.
To answer your question, disconnect the IPR and check for 12+ Volts at the red wire. The red/yellow wire is the control circuit. If you do not have 12+ Volts check fuse #113 in the battery junction box. If the fuse is open the first thing I would look for is a shorted fuel heater in the filter housing. ))))

So hope this helps too