You may have looked at my post about the fuel pump relay being inside the MAS. I too was looking all over for the fuel pump relay on my 190e 2.6. It wasn't till I saw in performance products catalog that it stated that the MAS contained the Fuel pump relay and the AC compressor relay. I don't know, unless you can take the MAS apart and change out the relay inside.
Was your sel not starting? What were your symptoms?
90 190 E 2.6 162K
91 300 E 117K
90 Laser RS turbo 169K
"The one who dies with the most toys wins"