1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 67Get this manual
CleaningInspection IClean fuel pump housing, check valves, pulse chamber and pump base in solven and dry all but check valves wit compressed air3Ins pect fu pump hou sing, pulse chamber an base for cracks or rough gaskcl surface and replace if all are found4lns peci filling 011 fuel pump hOllsing for looseness or an signs of fu el ai leaksReplace or tighl cn filling if leak is foull d