FUEL INJECTOR FOR DUAL FUEL APPLICATIONS HAVING NON-RETURN VALVE FOR LEAKAGE CONTROL

A fuel injector in a dual fuel system includes a first check movable in an injector housing between a closed position blocking a first nozzle outlet, and an open position. The fuel injector further includes a second check movable in the injector housing between a closed position blocking a second nozzle outlet, and an open position. A non-return valve is movable in the injector housing between a closed position blocking a nozzle supply passage, between the first fuel inlet and the first nozzle outlet, and an open position, to limit leakage between two fuel volumes in the fuel injector. The limitation of leakage may be performed during an operating mode of the fuel injector injecting only one fuel, such as a diesel fuel. Related apparatus and methodology is also disclosed.