Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 148Get this manual

Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 148

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FUEL JOINT, FUEL FILTER AND FUEL PUMP CHECKING THE FUEL JOINT
Do not overpressurize the fuel jointExcessive pressure may cause air to leak outChecking steps: (1)Attach the mity vacMity vac: YB-3