In only half-a-season with Uerdingen in 1987–88, Fach scored a career-best nine league goals, greatly contributing to the side maintaining its top flight status.

During a one-year span, Fach also gained five caps for the national team, his debut coming on 31 August 1988, in a 1990 World Cup qualifier against Finland, in Helsinki (he played the entire match in a 4–0 win).

[2] He also represented West Germany at the 1988 Summer Olympics in Seoul, where he played a role in the side winning a Bronze medal scoring 2 goals in the process.

After retiring as a player, Fach was appointed to coach the amateur team at Borussia Mönchengladbach (he worked with the club as a scout the previous year) and after a short intermezzo at Rot-Weiss Essen, on 21 September 2003 he became head coach for the former, leaving his post on October of the following year.

[7] After nine months without a job Fach was named on 25 January 2010 as the new head coach of the Kazakhstani vice-champion Lokomotiv Astana.