Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 153Get this manual
71, InstaH carburetors as an assembly 73.lnstaH attenuator cover and secure with 12 nutsTorque nuts to 60 lbin(6.7 Nm)
72Connect fuel enrichment valve input hose to top port carb uretorConnect fuel hose to top fuel pump