Yamaha F100B F100C Outboards Factory Service Manual, Page 86Get this manual

Yamaha F100B F100C Outboards Factory Service Manual, Page 86

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Fuel system
Vacuumpressure pump gauge set: 90890-06756 2 Apply pressure to each check valve portReplace if necessaryNOTE: Make sure that no air comes out of the opposite side of the check valve<