Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 57Get this manual
HIGH-PRESSURE FUEL LINE
REDUCING THE FUEL PRESSURE (HIGH-PRESSURE FUEL LINE)
WARNING
Always reduce the fuel pressure in the high-pressure fuel line before servicing the line or the vapor separatorIf the fuel pressure is not released, pressurized fuel may spray out1Reduce: Fuel pressure (high-pressure fuel line) Reducing steps (1) Install the fuel pressure gauge onto the pressure check valveFuel pressure gauge YB-0676690890-06766 (2) Place the drain hose into container(3) Open the valve and release the pressure2Drain: Fuel