I think i have the same problem, could someone advise me, as i am desperate as two main dealers have failed to find the problem. I think because the problem is an intermitent fault. When i turn the ignition on (on my 2000 806 hdi) sometimes i here a rumble, its air in the fuel line i think. The car as failed me twice, but i dont want to change the pump, if its not that. i had a new one fittted 2 years ago.
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