Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 180Get this manual
DIRECT FUEL INJECTION
Fuel Rail Removal
CAUTION
Fuel system must be bled off prior to removal of fuel system components
NOTE: Use FuelAir Pressure Gauge 91-168501 or 91-852087A1A2 to de-pressurize air hose first and then fuel hose1De-pressurize fuel system2Remove fuel injector harness from each injector by compressing spring clip with flat tip screw driver while pulling on connector
aPort Fuel RailAir Pressure PortSpring ClipFuel Injector