Hello all.
What are the symptoms of a weak fuel pump? Can they be only a deterioration in performance?
I have a 190E 2.3 (1991, kat), it is not that it runs very bad, but it idles rought and from time to time it even stalls when the A/C is turned on. The fuel pump has become somewhat noisy, as well.

BTW: How many fuel pumps does a 190e 2.3 (8v, kat, 1991) mount?
Thanks!