I am following this thread with interest as changed my 99 td5 3 weeks ago for 2003 model with 74000 mls.
So far have changed filter and air valve, Injector washers and seals whilst top was off thought just as well do Injector harness so replaced that.
Running a lot nicer when it runs but cuts out after a couple of miles have ordered a new pump today, beginning to wish I had re welded old faithfull which never missed a beat in 4 years.