I have a 1997 Range Rover 2.5 DSE Non starter due to code between Becm and Ecu being lost . Have visited dealer 3 times to have codes reinstalled. Each time I bring it home I open door with fob message centre states 'Alarm triggered' and will crank but fail to start. Battery loss then ensues ...

Can anyone help before I dive in and change everything. Engine not firing on 2.5 diesal . Suspect fuel pump or related matter. Are ther any considerations before changing fuel pump in respect of relays, fuses etc. Any advice would be helpful. thanks JB