SYSTEM FOR SUPPLYING FUEL TO HIGH-PRESSURE NATURAL GAS INJECTION ENGINE HAVING EXCESS EVAPORATION GAS CONSUMPTION MEANS

Provided is a fuel supply system for a high-pressure natural gas injection engine having an excess boil-off gas (BOG) consumption unit, which can consume excess BOG corresponding to a difference between an amount of BOG generated in the storage tank and an amount of BOG required as fuel for the high-pressure natural gas injection engine, when a larger amount of BOG than required as fuel for the high-pressure natural gas injection engine is generated. The fuel supply system for a high-pressure natural gas injection engine includes: a BOG compression unit configured to receive BOG, which is generated in a storage tank, from the storage tank and compress the received BOG to a pressure of 12 to 45 bara; a reliquefaction apparatus configured to receive and liquefy the BOG compressed by the BOG compression unit; a high-pressure pump configured to compress the BOG liquefied by the reliquefaction apparatus; a high-pressure gasifier configured to gasify the BOG compressed by the high-pressure pump and supply the gasified BOG to the high-pressure natural gas injection engine; and an excess BOG consumption unit configured to consume excess BOG corresponding to a difference between an amount of BOG generated in the storage tank and an amount of BOG required as fuel for the high-pressure natural gas injection engine.