Xantia 2l hdi running problem

[Jedp]

Hi new to this have checked previous post on the subject similar to my problem ive got a 2l hdi xantia estate keeps cutting out .starts ,ticks over ok, will rev ok,when it comes to driving will travel maybe 400yards then cuts out came up with the dreaded p0230 code its had new in tank pump filter change ,pressure regulator read that wiring to double relay could be a problem.hoping someone can point me in right direction .im at a loss cheers