Was a pink one on my 4i that used to have, though they were all pink for fuel pump, is on my cos as well.
Just wire fuel pump up permanent as temp measure.
Mine were both on the underside of dash above passenger footwell, and I am sure that I remember a fuse on each one, but might be getting mixed up due to age.
Yellow normal for relays, but NOT fuel pump.
As said will have BENZIN PUMPE, german for fuel pump on it, possibly also followed by word RELAIS(relay).
tabetha