Nissan TD42Ti wont start

[rusty_nail]

Hi Guys

My wife drove down to the shops to pick up groceries in and out 5 mins, only to find out the car wont start, there is just under quarter of a tank of fuel so i don't think that is the problem unless there is water or shit in the fuel, but there was no warning or spluttering of any kind, it drove down to the shops ok where she turned it off and when she returned it failed to start.
So i had to go and pick her up and my Nissan is still sitting there and i am going back to check what i can and take a jerry can with me just in case, but if it's not the fuel i was thinking maybe the immobilizer playing is up as it happened very sudden but how do you check that ?
Anyone have any idea's what else could be the problem.

Back soon.

possible fuel filter mate? is it cranking but not firing? need a little more info sorry.