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Well the control valve pulse width should be inverse of the pressure, the higher the pulse width/duty cycle number, the more the valve is open and the more pressure it vents. so it is good to look at both the duty cycle signal and the pressure. With a low PW/duty cycle number, it was...

Well unless oil is gushing around a cracked injector or failed seal:)

the earlier HEUI had separate lines, and they were a weak link. Anything long the path though that is exposed to the oil, like all the injectors and their seals could also cause issue… just exploring possibilities that would effect HEUI pressure… I wonder what his pressure looks like if he...

I would take the valve cover off and run it so you can see how the HEUI lines are performing under pressure…

I was thinking they did that supply filter as a retrofit kit to the 3126, and i recall now the aftermarket High pressure filter kit. The spool valves on the injectors most definitely need clean oil…

Did you find any debris in the valve you replaced? That would be a dead giveaway that the heui pump was shot. I recall they specced a modification and installed an oil filter into the HEUI equation. I can’t recall if it was in the supply to the pump or in between pump and injectors to protect...

Cat liscensed HEUI to ford for the powerstroke...

I played with this on a Ford power-stroke. Same basic components. it has a sensor that reads HEUI pressure and a pressure regulating solenoid valve PRV, that the ECU modulates to vent/regulate hydraulic pressure to maintain pressure according to program. An issue with the earlier powerstroke...