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111000 ex08kvk full service history: recently serviced. Last Aug 2013 similar problem. Diesel injection 'specialists' after 'looking at it for 3 days' fitted a afi switch - the control switch for the injection flow I am led to believe! It has helped over the last 8 months until the return of summer heat but did not fully resolve. (They left the cruise control and speed limiter not working - it was before they had the vehicle - but 'claimed it was not related as they had not done anything that would affect such - as cc and sp is not essential and I depend on the car constantly I did not pursue!) The recent very warm weather, similar to this time last year seems to have increased the frequency and as such, I have again returned the car to the garage to be looked at: Not sure what to believe now as initially this the 4th time of retuning it to them - they said the fuel tank would also need to be replaced and the fuel injectors need to be removed and sent off for specialist testing: quoted an enormous bill - which when I queried as the car is still within 12 guarantee for last 'repair' they then 'changed the quote' to claim that the fuel pump needs replacing and diesel cleaned out of the whole system as there is apparently 'iron type filing' traces in the diesel! After having 'tested the car' yet again over 3 days - as I insisted that they actually drive test it rather than just on a monitor: they have fitted again a new filter and said I should return it to them in 3-4 weeks so they can examine the filter!
Hope the above gives full background to assist. I believe it was an afi switch they fitted.
Thank you for this - they have claimed however it is 'silvery' filings. Which does not match your description of brass coloured: could the fuel tank lining be a silver steel colour and break down?
PS the dealer monitor did not reveal anything either!
Thank you I will pursue along the lines you suggest on Monday and see what they say