Originally Posted by TentGuy
I just went through the same problem. Just got it running yesterday. Long story...ford charged me $1500 to tell me I needed a HPOP. I put one on with the IPR (regulator) and it fixed the problem. You should have pulled injectors and taken them to a diesel shop for testing and replaced the O rings before just replacing them. Sometimes the pump can be OK and some of the O rings on 1 or more injectors could be bad and bypassing oil thus dropping the pressure so one whole side would be out. Get a 4000 psi pressure guage and check pressure at the oil rails but sinced you change injectors already the most likely cause is HPOP. Make sure you change the regulator with it.(IPR)
One quick check...pull the oil line off the pump going to that side and check to see if the pulse spring is jammed in the pump fitting or in the line itself. These have been known to jam causing a blockage in the line thus preventing oil from flowing to that side. It's a small spring (check valve) type thing installed just under the pump fitting used to smooth out the flow of oil so no pulsing in the oil flow. Probably not the problem but you could get lucky. I removed the pulse spring all together from that side and then I had oil to that side but not to the other side where the ICP sensor is located and the truck wouldn't start. This is an indication that the pump is not putting out enough pressure to push open the pulse spring on that side and let oil flow. Follows the path of least resistance.
Glad to hear you got yours up and running! I agree that other things should have been checked before swapping the injectors and I also know the trouble you had with yours, but you catch more bee's with honey.........................
you were a little rough on him, Otherwise Great info!