If your car is on a 51 plate or newer, think long and hard about this: modern diesels produce so much power and eficiency because the engines run at incredibly fine tollerances. I know of an AA man who has recovered several modern diesel cars with fuel pumps knackered due to running on bio fuel.
Obviously this is a top end quote, but when I worked at BMW, a repair bill of £7000 was around average for a replacement fuel system...
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