Vauxhall Frontera 2.2dti RS 1998 (S)reg?

Car was driving and all of a sudden it just cut out and would not start again.
Had diesel pump repaired with new driver and pipes on it, put a new crank shaft sensor on car. Mechanic put diesel pump back on and it actually worked it ran for 17 miles and when I went to use it again it wouldnt start and was just trying to fire up but no diesel coming through again just like when it first died!