to quote the mighty haynes manual:
"Only diesel vehicles fitted with the td4 engine up to 2003 model year have a fuel tank mounted pump."
"Only diesel vehicles fitted with the td4 engine from 2003 model year have a wheel arch mounted pump"
Manual No. 3929, Section 4B.8 Fuel Pump Unit - removal and refitting
what are the symptoms, did it cut out while running, or did it refuse to start ? I assume it's the td4 engine ? give us some more info !
If it's refusing to start, it could be many things, including (commonly) injector fault, (not so common) cam sensor and so on.