What is causing my C-Max's fuel filter to block?

My 20,000 mile Grand C-Max 1.6TDCI, after several transient episodes, recently went into permanent 'limp home' mode. The dealer reported that the fault was due to a partially blocked fuel filter, and the computer locking out due to “inadequate fuel supply”. The dealer further reported that they are presently having many cases of this in cars using various suppliers of fuel (BP seems notably exempt). Do you have any knowledge of, and advice in this matter?

Asked on 27 April 2013 by MGS, Oxford

Answered by Honest John
Yes, it's very common due to the moisture content of cheap part bio-diesel. This emulsifies in very cold weather and blocks the fuel filter until residual heat in the engine compartment melts the emulsion.
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