Im going to take the high pressure pump off and send it to bosch and have it tested ..will see what happens

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If you have it running, stop it and try a restart straight away (say within 10 seconds of fully stopping) does it start quicker? If so, you probably have a slow air leak between the tank and the LP pump.

Another cheap & easy check is to install a non-return (check) valve in the rubber line between the filter and the steel line from the tank.

Have you replace the fuel pressure regulator at all?

The injector leak back results look OK to me but they could be confusing the pressure regulator too, does the car run well in the return line in disconnected?

Jason

It can run for an hour if i switch it off and try to start again nothing cranks forever until i spray quick start

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New regulator from mb ..havent disconnected the return while engine is running

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I have started it yesterday engine was cold its making a grunting effect when idling grunt grunt grunt ..like its loosing pressure the pump has 12month gaurantee from july last year so will send it monday back to bosch to have tested will ask if they can test the fuel regulator aswell

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I sympathise with your plight - my CRD is off the mechanic on the 14th to see why it stopped mid-flight. Hopefully it is something as simple as air in the lines.

Attached is a link to a You Tube video I think you might find interesting. (There is a photo of the Grand Cherokee, but I think it is the 2.5l Cherokee.)

I love how the Jeep stealership wanted to replace the engine!

It just shows how hard it is to diagnose problems with these CRDs.

There are other videos on this channel which you might also find interesting.


Enjoy!