2001 3.0 l turbo diesel starts then stalls

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Living in the Uk now, problem intermittent, never happens at the garage, just replaced cracked head, new radiator, was blowing lots of white smoke. Hopeful that would correct the non start, but home 3 days, dropping out again. Usually after it sits, it starts again and runs for weeks. Replaced fuel pump 6 months ago as we thought this was the cause.