hi all had this come in as a none start i have only 1 fault code for glow plug system all heater plug have been replaced as only one was working and now have no code stored.have now mitivaced fuel return system and loosing vacum so have replaced injector seals and have managed to get it to start but when left for a hour or two is strugling to start and when it does start it runs rough for a minuite then clears,when reved to 2500 engine starts hunting and once warm will start no problem tinking may be fuel pump any sugetions thanks craig