Help! My freelander won't start

Hi

Im just hoping someone can give me some advice. My freelander has been out of action, with a mechanic for a week now! He's a family friend.

My freelander has 84k on and ran smoothly. Occasionally the Downhill decent and TC light would come on and then off again. But last week I started her up, she felt a bit weak. Drove her round the corner and she cut out, no warnings. Now she won't start !

The mechanic couldn't find a fault. However he has changed fuel filter, fuel harness to sensor and still no joy! The car turns over, just won't start

Any ideas ? Thanks in advance

O ring on fuel injection pump is one possibility, low pressure pump another ..

freelance said:

O ring on fuel injection pump is one possibility, low pressure pump another ..

Click to expand...

Thank you ! We've tried a few things, new harness to sensor, fuel valve. Still not starting! Next step mechanic said is to change fuel pump miss my freelander need it back

Update /story so far
As mentioned my 2005 TD4 sport Freelander just cut out whilst driving, with no warning and now won't start.
Story so far is the car turns over healthily, immobiliser and Dash lights are all normal. When ignition turns on the dash lights illuminate as normal. Turns over strong and healthy but will not start.
Diagnostics reveal no problems or codes.

So we've checked the rear fuel pump that's ok, changed the filter and still no start.
We've checked the fuel sensor harness and replaced, still no start
Check the fuel rail pressure sensor and supplier fuel was present but not under pressure. So we've replaced with a new fuel pump regulator valve and she still will not start.
So the vehicle turns over normal with no start, rechecked pressure in fuel rail on turning of key and same symptoms as above, fuel present but not under pressure?? Is my fuel pump gone? Broken?
Before replacing it is there anything else I can check?
Thank you in advance
Please help me get my beloved freelander back