Yamaha 115-225 HP Outboards Service Manual, Page 79Get this manual
FUEL FUEL SYSTEM
E210600
Fuel pump 1) Disassemble the fuel pump2) Visually inspect the pump body for cracks, and replace if necessary3) Inspect the valves for cracks or distortion, and replace if necessary4) Inspect the diaphragm for sign of damage, perforation or stretching, and replace if necessary5) Assemble the fuel pump with new gaskets
E2 10900
Prime starter (225) 1Leakage test