2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 298Get this manual
2) FUEL COOLER The fuel cooler is incorporated onto the fuel feed pump to reduce the fuel vaporThe cooling-water is supplied to the cooler from the water jacket of exhaust-outer-cover, and then discharged through the pilot hole
Water (IN)
Fuel (OUT)
Fuel cooler
Water (OUT)