Engine cooling system

An outboard motor comprised of a power head containing an internal combustion engine and a protective cowling enclosing said engine, a driveshaft housing and lower unit depending from said power head and containing a propulsion device driven by said engine, said engine having at least one combustion chamber, an intake system for supplying air to said combustion chamber, a fuel delivery system for supplying fuel to said combustion chamber, said fuel delivery system including a fuel supply mechanism for supplying fuel under pressure to a fuel injector through a fuel conduit, said fuel injector supplying fuel to said combustion chamber, and a cooling system for said engine, said cooling system including a cooling jacket for said engine and a cooling jacket for said fuel supply system, a coolant supply mechanism for drawing water from a body of water in which said outboard motor is operating and supplying water to said engine cooling jacket, a thermostat for sensing the temperature of water in said engine cooling jacket and returning water to the body of water when the temperature in said engine cooling jacket is above a predetermined value, and for supplying a portion of the returned water through said fuel supply system cooling jacket only when said water is above said predetermined temperature.