Fuel Injector Valve Seat Assembly Including Insert Sealing Features

A fuel injector comprising

• a fuel injector housing;
• a valve seat disposed in the fuel injector housing, the valve seat including
• a base that is mechanically connected to an end of the fuel injector housing and includes an inner surface, and
• an insert that cooperates with the base to define a spray hole that extends between the inner surface and an exterior of the valve seat;
• and
• a valve body disposed in the fuel injector housing and operable to move along a longitudinal axis of the fuel injector housing between a first position in which the valve body abuts the inner surface and in which fluid is prevented from passing through the spray hole, and a second position in which the valve body is spaced apart from the inner surface and in which fluid is permitted to pass through the spray hole;
• wherein an interface between the insert and base is shaped to provide a fluid seal at the interface.