Yamaha F100B F100C Outboards Factory Service Manual, Page 14Get this manual
GEN INFO
General information
Fuel pump and fuel filter The fuel pump found in the F115A has been adoptedAlthough the quantity of parts has been reduced and the necessary servicing time has been decreased as well, the ability of the fuel pump to supply sufficient fuel has been retainedA water separation fuel filter has been adoptedWhen water is mixed with fuel, it is separated and precipitated at the bottom of the filter to prevent it from flowing to the carburetorsAs water gathers in the fuel cup, the red float inside the cup begins to rise, indicating that the accumulation of water is taking placeAfter water has gathered in the fuel cup, the fuel filter can be disassembled to dispose of the water