2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 18Get this manual
GEN INFO Fuel system
General information
The fuel flows in the following order: fuel filter, low-pressure fuel pump, vapor separator, high-pressure fuel pump, and injectorsThe excess fuel at the injectors passes through the pressure regulator and fuel cooler, and returns to the vapor separatorWhen the engine start switch is turned on, the injectors of all cylinders operate before the pump relay is actuated to prevent the injectors from sticking