hi all problem is my 200 tdi 90 is reluctant to start in the mornings its not the plugs ive tested them feels like maybe the fuel is running back ? once started it won't rev for a few seconds even with my foot to the floor then perfect all day i've checked the leak off pipes for splits ect and think there all fine could it be the lift pump somehow ? or any other ideas how to check or what to look for please ? thanks in advance