2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 86Get this manual
Fuel system 2Measure the length of the Prime Start plungerPrime Start plunger length (reference data): 10.7 mm (0.42 in) at 24 (75 F) 3Connect the Prime Start blue (L) leads to 12 battery as shownMeasure the plunger length after applying power for 10 minutes
5Check the floatReplace if cracked or deformed6Measure the float height aReplace the float or needle valve if out of specificationS6AG4220
S6AG4210
S6AG4230
NOTE: Measure the float height when it is resting on the needle valve 2Do not push down on the float Take measurements at the float position shown opposite its pivoted sideFloat height a: 15.0 1.0 mm (0.60 0.04 in)