Check out the fuel shut off solenoid.
The only reason a diesel wont run when warm is if it has no fuel.
Probably the Glow plugs (the diesel pre-heats) need replacing.
wont start after changing fuel filter
Diesel engines work in a different way to petrol in that they work on pressure to ignite warm diesel as opposed to petrol engines which have spark plugs. in order to work, there can be no air, air wont ignite!!
Jump start car and ensure alternator and battery are good.
possibly the glow plug comand is bad.
i have a Renault medan td i ran out of diesel and the battry was low now the car wont start only when its being bumped
possible weak batteries?
Did you prime the fuel system after changing it?
What did you not hook up again?
Glow plugs nee changing!
Could be for a number of reasons. A proper diagnosis is required to narrow it down.
check cold start sensor or cold start valve is the same dif. name, also check for the coil pack could be in short good luck