Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 33Get this manual
Cleaning and Inspection 1Carefully inspect carburetor body casting for cracks, stripped threads, plugged or restricted passages and passage plugs that show sign of leakage2Thoroughly clean all carburetor parts with mild cleaning solution (that will not damage rubber or plastic) to remove dirt, gum and varnish which may have accumulated 3After washing parts, blow parts dry with compressed airBe sure to blow air thru all passages, orifices and nozzles4Check float hinge in the float pin area for wear and check both float chambers for leaks5Examine inlet needle for wearIf worn, replace with new inlet needle