E70 35D Stall while driving crank no start

[Phil C]

Originally Posted by RDAvena

As a "while you are in there" check on changing/verifying the crank sensor
pull the metering unit off of the CP3 pump and look for metal flakes. Had the same no start condition and the CP3 had eaten itself due to water contamination.

CP3 = High pressure pump right?

by the metering unit do you refer to the 'control flow regulating valve' in some documents?

Any bleeding process if metering removed/replaced? Run low pressure side using scanner?

Thanks for the advice.

Phil

[RDAvena]

Originally Posted by Phil C

CP3 = High pressure pump right?

Phil

Correct. The high pressure fuel pump. No special steps since it is a visual check to see if there are metal flakes present on the regulating valve. At most some paper towels to catch the fuel draining out of the pump. On restart the low pressure pump will fill to the HPFP.

[Phil C]

Gave up on taking out the regulating valve. Just couldn't get to the third (lower) bolt without taking the manifold off. Tried all sorts of gymnastics with double quarter drive universals etc but no way I could get the torx engaged. So I went under the car and put a manual pressure guage on the downstream end of filter (6-7 bar with pump run on 120l/hr using Foxtel) Then pulled filter. Upended the filter into a glass jar. perfectly clean diesel, no water, no sediment and no metal flakes. I'm hoping that means my HPFP is ok.
Not exactly sure what to do next. I hate to swap parts without a solid diagnosis.

Rail pressure regulating valve off back of rail?
Control flow regulating valve off pump.

Seems like I have to remove manifold for either which also means disturbing a million other connections.

I'm concerned that i'm missing something else which might be leading to the DME downregulating the fuel pressure.