Mx13 head scratcher

[mikkhh]

Lift pump I mentioned because you told that you pushed in diesel at 40psi. So you pushed in fuel instead of pulling fuel and air out via that port? Can you send a picture, where you did it? I have used hand type vacuum pump to prime hard to prime diesels via pulling vacuum at return line / bleed port so the fuel reaches where it should reach.

Did you check fuel shut off solenoid resistance? Did you unplug it and then checked again for codes to see if you unplugged the correct thing?

Did the customer tell you the full story? How the fault started? What other things were done to it?