2009 Yamaha F40 Outboard Service Manual, Page 173Get this manual
Vapor separator (disassembly)
The float should be resting on the needle valve when measuring the float heightDo not press the float4Install the filter g
Do not reuse the float pinAlways replace it with new one Install the float pin with its tapered end facing towards the mark on the float chamber cover3Measure the float heights and cAdjust the float heights if out of specification