may be this will be of some use to you. i had a fuel fault with my pug 406 hdi 110 & took it 2 my local dealer. they told me i had low pressure in fuel pump & wanted big money of me to fix. i had a second opinion..& it turned out i had bought a duff fuel filter from (wait 4 it ) halford's. this might help you
peter - k, December 2007
