Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 166Get this manual
Fuel Rail Disassembly The starboard fuel rail contains fuel injectors and tracker valveThe port fuel rail contains fuel injectors, fuel fuel regulator and air regulatorNOTE: Each fuelair inlet or outlet hose adaptor has an o-ring sealThis o-ring should be inspected for cuts or abraisions and replaced as required when fuel rail is disassembled for cleaning1997 Model