Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 165Get this manual
1998 Model
NOTE: On 1997 Models only, there is filter in the air line adaptor on the starboard fuel railInspect filter for debris and clean as required
aAir HoseRetainerAllen Screws (remove)
aFilter
1998 Model
NOTE: It is recommended that direct injectors remain in the cylinder head (if they are not to be replaced) while removing the fuel railThe direct injectors have teflon seal which may expand if the injector is removed from the headThis expansion may cause reinstallation difficulty or require the replacement of the seal4Remove nuts securing fuel rail5As fuel rail is removed, use flat tip screwdriver to hold direct injectors in cylinder head