Dual fuel injector having fuel leak seals

摘要

A dual fuel common rail fuel injector (12) includes a first and second check needle used to selectively inject two different fuels such as diesel and liquefied natural gas. The fuel injector (12) includes a fuel separator (71) disposed in the interior cavity of the first check needle and is in sealing contact with the nozzle. The fuel separator (71) is configured to prevent commingling of the diesel fuel and the liquefied natural gas. The fuel injector (12) also includes at least one sealing member (250) that is configured to prevent the diesel fuel from leaking from the diesel fuel check cavity (66) into a gaseous fuel orifice.