Fuel injector with integral damper

An engine fuel injector comprising:

• an internal fuel passage in the injector and having an inlet end and an outlet end, the inlet end being connectable with an external supply of fuel under pressure for supplying pressurized fuel to the fuel passage, and the outlet end including an injection valve rapidly operable to selectively open and close the fuel passage to the discharge of fuel from the injector through the valve, whereby rapid changes in the rate of fuel flow through the injector may cause rapid variations in fuel pressure in the injector;
• and
• a fuel pressure damper in the injector and associated with the internal fuel passage between the inlet and outlet ends, wherein the damper includes a variable volume chamber associated with the fuel passage and responsive to pressure variations in the fuel passage to vary the chamber volume, thus reducing the amplitude of the pressure variations in the fuel passage and thereby reducing changes in the rate of fuel flow upon opening and closing of the injection valve.