Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 31Get this manual
Installation 1Place seal (a) into carburetor throat2Slide carburetor onto crankcase cover and secure by tightening clamp screw (b) 3Connect fuel line to carburetor (c) 4Reinstall front cover and install knobs on throttle and choke levers