FUEL SUPPLY DEVICE AND RETURN FUEL UTILIZATION BUFFER JAR

A fuel supply device includes a return fuel utilization buffer jar (13) that conducts fuel into a fuel inlet port (111) of a first three-way valve (11) including a one-way check valve to allow the fuel to flow, uni-directionally, from the fuel inlet port (111) to a fuel outlet port (112). Return fuel from an engine is conducted in through a return fuel inlet port (13131) of the return fuel utilization buffer jar (13). Fuel vapor in the return fuel utilization buffer jar (13) is guided from a gas inlet port (122) of a second three-way valve (12) through a gas outlet port (123) to a fuel tank. Vapor pressure in the return fuel utilization buffer jar (13) is regulated by a ventilation port (121) that is mounted in the second three-way valve (12) and includes a one-way check valve in a direction toward the gas inlet port (122).