I was driving down the freeway when my truck just cut out and would not start again.
since then ive tested everything i could find for no start issues. Ive replace the cam and crank sensors. The ficm tested at 48v and at 47 when cranking. The icp reads 980psi when cranking and the ipr is at 85%. I am getting no codes at all. Fuel pressure is good all the fuses are good. Does anyone have an idea of what to check next? thanks for your help

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i forgot to add a few things. 162k on the truck i recently added an K&N air filter to the truck. A few hours before the truck died on me it was hard starting but then was good on the next few starts. The truck gets driving every day and sometime on long road trips. it doesnt do much towing. A few months ago i suspected fuel in the oil. After about 2k of dri ing the truck wouldnt start when it was warm and i was getting 2 extra quarts out when i would change the oil. so i did all the seals on the injectors even the seal on top that the oil rail nipple goes into.That seams to fix the issue of the oil being thinned out. The hpop has about 20k miles on it. It was installed by Redlands ford in California. I had an airdog 2 fuel pump installed a few years ago. The high pressure lines on the oil rail have been upgraded.

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The icp was replace 2 years ago along with the connector that goes to the icp.

 

Check the Low pressure oil pump, you can pull the cap off the oil filter and hold just the oil filter down and have someone crank it to see if it fills up with oil, if it does then just lift the filter up and it will drain. if not the the low pres pump has failed or the pressure relief has failed on the low pres pump.
The ICP pressure, is that desired or actual???? because the IPR is at 85%, that is maxed out, normal while running is 15-25% and for starting maybe 40% so I am thinking the ICP pressure you have listed is the desired and not the actual pressure. Actuall pressure has to be at least 500psi fo it to start.
It is very common for the IPR to get clogged up shortly after a HPOP install, basically it is crap that didn't get cleaned out from the old pump. You can pull the IPR and check the screen in it and if it is clogged up you can clean it off but if it is torn then you have to replace the screen.

To me if it dies while driving then it is either a HPOP or the low pressure pump

 

thanks for the info i will check those things out. maybe im confused about the icp pressure but on my friends scan tool it said icp was at 65 not cranking then when cranking it jumped to about 650 then 800's then 900's. the ipr did say 85% though so you think its clogged? and do i remove the turbo to pull the ipr? would i still get those high psi from the icp if the hpop was bad?

 

As long as it is ACTUAL ICP pressure then it should fire if it has 500psi, what concirned me was the 85% duty cycle on the IPR valve, it shouldn't be that high if you had that kind of pressure. The IPR is a electric valve that opens and closes to keep the pressure where the computer wants it to be, the ICP sends a signal to the computer what the actual pressure is then the computer tells the IPR to close more/ higher %/ if the pressure is too low and close less/ lower%/ when needed.
The 85% tells me the ICP was alot lower then what the computer wanted to see so it was closing the IPR as much as it could to get the pressure up, 85 is the max the ipr can cycle.
You can get to the IPR if you remove the air filter assembly, pull the degass bottle forward and toward drivers side some, then remove FICM. you can look right under the turbo toward the back side and see the IPR, the sensor behind that is the ICP sensor. sometimes just removing the last intake bolt that is a stud with a ground on it helps so you can get a hand in there to work. They make a special socket to remove it or you can use a shortened up wrench to get it.

 

2003 F250 NEED HELP NO START CAN ANY BODY GIVE IDEAS