A fault with the fuel supply can certainly strand a vehicle in its tracks, but there are a thousand other things that could be causing your problem. It would be worth checking the operation of the fuel system, though, as this is a common problem with modern turbo-diesels. Has the vehicle been run out of fuel recently? That can cause all sorts of knock-on problems when you try to restart the engine. Contaminated fuel (often containing water which modern diesels hate) can also cause this sort of problem. A properly equipped workshop should be able to carry out an electronic scan of the vehicle’s systems and diagnose quickly and efficiently what the problem is.

Has any work been done that might have involved disconnecting the electrics? I would suspect that there could be a problem with the wiring connections. Best take it to an auto elec.