Freelander td4 2001 desperatly need help !!!

Hi ,

I have a landrover freelander td4 2001 ( with BMW engine )

I went fishing a week ago and my car just wouldnt start and had to be towed home and is a problem starting one min it starts and next min it wont start unless i fill fuel filter with diesel

Had codes read and 1 time the mechanic said showing as non return valve needs replacing and today had them read again and showing these codes :

1260 delivery pump control system
0404 Exhaust gas ?
1612 Engine control module incorrectly coded
11?0 ( BAD WRITING BUT KNOW ITS FOR REGULATOR )
1255 Deliver pump pressure sensor
1195 Fuel pressure control sensor / valve

Also started smoking a bit , has little loss of power and fuel runs bank into tank when turn off ignition which emptys fuel filter

And mechanic reacons its something to do with little pump thats behind the back wheel ??

If someone has any idea what needs to be done i would massively appreciate it as not been able to work as car keeps letting me down when going on jobs etc and mechanics in my area seem to be useless