6.0L Powerstroke: Oil rail air leak test. The easy way!!! 

You have to do the air pressure test as I showed. You didn't mention that you checked the STC (snap to connect) fitting on the back of the HPOP. The air test will show if you have a leak there.

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You're throwing parts at the truck. p2623 circuit open means the Injector pressure regulator is not connecting to the FICM (Fuel Injection Control Module) due to a wiring problem. Check the connector end at the High pressure oil pump,, check for bent pins in the Valve, check that the wires and connector are not melted because the heat blanket wasn't installed around the wires, check the wires aren't cut or broken, check for spread female pins at the connector, check that the small plastic insert is installed and not broken or deformed for aligning the 3 wires when you plug the connector to the sensor, check that the Pins aren't bent for the 3 large connectors under the FICM, further check that none of those pins are bent. These are all visual checks. You can test the ICP valve for broken coils ( there's two coil circuits internally sharing a common pin ) you can check the FICM wiring harness for connection from the ICP plug to the FICM connector. Past that the last option would be a FICM and that's 100% never the problem. Usually it's install error, worn in two harness, bent pins, not completely locked FICM connector.

@klassena1995 Same here, what did you find out?

No dummy plugs

Mine ended up being top injector seals and nipple cup orings. Got er done. Thank goodness not the hpop I paid to have replaced when I broke down out of state a few months back. Thanks for sharing your process. Helps folks like me.

You probably should start by monitoring fuel pressure, the engine low pressure oil, and also the high pressure oil. Monitor those and find out what you think you might loosing when it stalls. If yours is a stock 2003 it's most likely the HPOP pump itself. The turbo is really easy to remove. Once it's removed you can have better access to the ipr and icp

It's always better to do both. The other side that isn't leaking will start leaking eventually

There could be. You didn't mention how far you drove it. There's also a chance you dislogged some debree while removing the IPR if thats how you did the test. I would remove the IPR, clean it, and re-seal it with a new screen.

These are symptoms of a factory ford filter being used with a tall aftermarket oil filter cap.

You have a leak somewhere even if you might not be able to hear it.

If you have a verified problem of no oil pressure building for the High pressure oil pump ( 500PSI minimum when cranking engine over) and you have no audible air leaks when pressurizing the Oil rails through the IPC sensor port then you have a torn HPOP reservoir screen and a clogged IPR screen, or the IPR screen is torn / never installed/ not equipped and the IPR valve is stuck open from trash in oil after a repair or small metal shaving usually from the front cover being eaten by the oil pump gears. No the oil filter doesn't catch every piece of damage shavings from the front cover because there is a bypass built into the oil flow that can allow the shavings to get past the oil filter where it travels on to the HPOP screen which is usually torn open allowing the shaving to continue forward whereit enters the pump or the IPR screen filters it out till the valve no longer gets oil flow or the filter screen breaks and trash holds the valve open.

Yes that will work. Its best to have a valve on it

@@prodieselrepair3218 thank you so much, I've been asking this question on Ford forums and I've never gotten an answer. My background is completely unrelated to mechanic stuff so this is all new to me. Also, where can I find a on/off valve? I found the air pressure test fitting and the socket on Amazon for the IPR valve. Can I get that on/off valve at harbor freight.

@@spicyalpastor3310 yes, or Home Depot / Lowes

It's probably the STC fitting from the output of the high pressure oil pump

@@prodieselrepair3218 I'm hearing air on the passenger side under the oil rail somewhere?

@@dandunning4409 yup. That's most likely the STC fitting.

@@prodieselrepair3218 Hmmm, it's a crank no start so he replaced the IPR valve, and the pic and the dummy plug and stand pipe. Doing the air test via the ICP hole I can hear air going through the rail and it also sounds like something is clicking but I can't find any air leaking.

@@dandunning4409 just like I said......the STC fitting. Google it. "Snap To Connect" fitting. It most likely blew out.