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There seems to be 3 or 4 post on this subject at the moment, rather than post a reply to them all I will post my experience of the problem here!
Having started off with the engine hunting for a while on initial start up then developing the intermittent limp mode, I finally took my car (2004 dCi SVE) into a local independent garage who diagnosed the problem as faulty fuel suction valve (P0089), this was eventually replaced by my local Nissan dealership but did not initially cure the problem. They then advised that they would need to remove the fuel pump and send it away to their fuel injection specialist as the next step recommended by Nissan UK.
At the specialist it was found that the fuel pump was a bit stiff and needed freeing up before testing, which they did, after testing the only fault they could find was with the fuel suction valve which my Nissan dealership had just replaced, or more to the point the new suction valve was operating at the very lowest point on the permissible scale, on a 1 to 10 basis it was a 1, but within the allowed limit (just), they replaced this again and the second suction valve was found to be closer to the centre of the scale and declared fixed and fully operational.
Now I won't bore you with the arguments that then followed, but the Nissan dealership then undone the work of its specialist to prove a point that the original fuel suction valve they fitted was not faulty, retuning the pump back to the car and testing, and then declaring the fault has gone, which to be fair it seems to have.

So in short, the problem (at least in my case) seems to be a combination of faulty fuel suction valve and a stiff pump, and fixing only one of these issues won't cure the problem.
To get to the stage I'm at now has taken just over two months, two garages, two fuel injection specialist, two loan cars and just shy of £900, not to mention endless phone calls!
At least it didn't come down to a new fuel pump at £2k+ for which I must be thankful, and I have 10 months left of a years warranty for parts and labour on the new suction valve.
 
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