[janewish]

Cut out when I was driving and hasn't started since changed fuel filter and now I have been told its the fuel pump in the tank could it be anything else

[Hometune]

What checks have you done?

[janewish]

My brother and friend has checked fuses and other things but said something about diesel nit getting frew so have said that its fuel pump

[Hometune]

Disconnect the fuel pipe at the fuel filter that comes from the tank and then crank the engine. Diesel should flow out of the pipe. If it does not then suspect the pump or its relay.
If it does flow out then crack open an injector. If fuel does not squirt out then the fuel pressure regulator (shut off solenoid may be faulty).
Or do a diagnostic check with a quality tool and check the fuel pressure when cranking the engine. You need at least 280 bar to start the engine and ideally should be 300 bar within 2 seconds.