My TD5 is cutting out as if out of fuel. It will get to the bottom of the drive or slightly further but will then cut out on a bit of load or even with no load. Then it's hard to start, but after purging the system a number of times it will go again and run perfectly. Since it started to do this I have changed in this order, fuel filter, injector harness, fuel pressure regulator with gasket and new O ring, another new filter, fuel injector seals copper and O rings, fuel pump in the tank, also nothing shows on diagnostics. When every one of those items have been replaced it will do the same, start up run perfectly and rev away great, then cut out at bottom of drive or slightly further up the road. Also noticed the fuel pump always runs when ignition is switched on it never seems to prime after a few seconds, but will always run the full length of prime timer. I also thought there was air in the fuel system but now after the new pump fitted i dont think so. Help i'm going mad.