no need for a write-up for that, very easy. Just follow the lines, there is the valve with electric connections, and the line goes to the fuel charcoal filter.
see here
So basically what you have to remove is the MAF on each side, airbox also, the fan I would also remove for easier access, the washwater tank on passenger side.

here you can see the hoses on pass side
Louv has changed his engine, so many pics here which help you

http://www.louv.tv/cars/750/engine/

E32 750iL 11/88, E32 750iL Highline 03/90
7 series Tech Tips

• Any write ups on how to replace this hose - AKneppers 2008-09-06 17:21:42 (55 views)
  • Re: Any write ups on how to replace this hose (pic) - AKneppers 2008-09-06 17:22:25 (101 views)
    • fuel tank/breather hose most probably (url) - shogun 2008-09-06 20:05:37 (66 views)
      • Thanks replace with no problems (nt) - AKneppers 2008-09-07 20:04:16 (24 views)