Hi everybody, this is my first post so any help would be great. My partner has a 300tdi disco and for the past week its been a nightmare to start. It just cranks over for nearly a minute before it goes even when the engines hot ! So far i have replaced glow plugs / fuel filters/ I drained the sedimentor and fully bled the system. I checked the cut off solenoid was working and is and so now im sort of stumped as to what might be up. Air is obviously getting in somewhere, but ?????? Where ????? pls help anybody,