Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 164Get this manual
Fuel Rail Removal
2Remove fuel injector harness from each injector by compressing spring clip with flat tip screwdriver while pulling on connector
Fuel system must be bled off prior to removal of fuel system components
1De-pressurize fuel system by wrapping clean cloth around fuel pressure port valve (STARBOARD fuel rail) and depressing valve core1997 Model