Changing fuel filter on 98 Jetta TDI - TDIClub Forums May 12, 2011Changing fuel filter on 98 Jetta TDI VW MKIII-A3/B4 TDIs. Welcome to the world of diesel. When doing your fuel filter you might want to fill up the filter with diesel purge, great stuff to cleaning out the system. 1998 jetta tdi fuel filter | eBay www›Search›1998 jetta tdi fuel filterFind great deals on eBay for 1998 jetta tdi fuel filter. Shop with confidence.