2009 Yamaha F40 Outboard Service Manual, Page 143Get this manual
Hose routingFuel line
Fuel line
Reducing the fuel pressure
Always reduce the fuel pressure in the high-pressure fuel line before servicing the line or the vapor separatorIf the fuel pressure is not released, pressurized fuel may spray out1Start the engine2Remove the fuse holder cover a, and then remove the main fuse (30 A) b
2Release the lock by pulling a, and disconnect the quick connector by pressing both sides of b3Disconnect the quick connector from the fuel rail