HPOP...I think

[Schooner622]

I have an 06 F250 6.0 FX4 Lariat with 146000 on the clock. It recently died on me. After being run in the morning I went outside after lunch and it would not start. It cranks fine and everything electrical seems to be operating properly. She has brand new batteries. Since I just got an EGR delete that I wanted to install, I went ahead and tore down to the HPOP thinking the STC fitting was the problem. After opening it up I realized it looks like the previous owner already had the STC fitting replaced with the updated unit. So now I am stuck with a partially torn down engine wondering whether or not to put it all back together and try again or if there is a way to test the HPOP to see if it is bad or not. Any advice?

[dhanna6powerstroke]

You need to pressurize the system through the ICP port and command the IPR valve closed. This way you can listen for air leaks. I'd say you have a stand pipe or dummy plug issue.

[a2elvis]

While cranking does the oil pressure gauge on the dash come up?

[Schooner622]

I actually did not think to check before getting into it. I was trying to fix it in a timely manner.

[Padrino]

Just had my HPOP replaced last week, same situation. I drove it to work, turned it off for 2 minutes and then it wouldn't turn over. Tested it and it was getting about 25% of the psi it needed to start. $1500 job but luckily warranty covered all but taxes!

[Schooner622]

How do you test the pump out of the vehicle? I don't really want to reassemble just to have to take it all apart again.

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[Padrino]

My mechanic did the test, I don't know how

[dhanna6powerstroke]

You can't test it out of the vehicle. All you have to do is cut your existing IPR valve wiring harness or get a spare pigtail, ($15 from dealer), ground one side and apply 12 volts to the other. Doing that will close the valve. You will have to remove the ICP sensor from the passenger side valve cover and find an adapter that will screw into its place that you can apply a minimum of 100 psi to. Once you have air supplied to the ICP port, supply 12v to the IPR valve to close it and start listening for air leaks under the valve covers.

[dhanna6powerstroke]

If you have access to a good scan tool, Auto Enginuity or you have and Edge Insight or Scan Gauge, you can monitor your ICP while cranking the engine but that would require putting everything back together.

[Schooner622]

Thanks for the help, I will be doing the air test in the morning. Any idea what size threads that sensor is? And where is the best place to buy a new pump (if that's what it is) besides the stealership?