2009 Yamaha F40 Outboard Service Manual, Page 153Get this manual
Fuel pump assembly
Assembling the fuel pump assembly
Before assembling the fuel pump assembly, clean the parts and soak the valves and the diaphragm in gasoline to obtain prompt operation of the fuel pump assembly1Install the springs and b, the plunger c, and the diaphragm dd
5Install the fuel pump body f, new diaphragm g, and the cover h, and then tighten the fuel pump screws to the specified torque2Align the hole in the plunger with the hole in the diaphragm by pushing the plunger and the diaphragm3Install the pin e