An intensifier type fuel injector comprising: a needle chamber; a needle in the needle chamber having a first position blocking fuel injection and a second position allowing fuel injection; an intensifier having an intensifier piston and a plurality of intensifier plungers for intensifying a fuel pressure responsive to an intensifier actuation fluid pressure, wherein the intensifier is coaxial with the needle and the intensifier plungers are distributed around the axis of the intensifier piston and the needle; first valving coupled to control intensifier actuation fluid over the intensifier piston; second valving responsive to a needle actuation fluid to controllably; maintain the needle in the first position against an intensified fuel pressure in the needle chamber, or allow the needle to move toward the second position responsive to intensified fuel pressure in the needle chamber; a needle control piston, the second valving controlling needle actuation fluid pressure on a surface of the needle control piston to move the needle to the first position when needle actuation fluid pressure is applied to the surface of the needle control piston, and pressure in the needle chamber forcing the needle toward the second position when needle actuation fluid pressure is not applied to the surface of the needle control piston, at least one intensified fuel storage volume coupled to the needle chamber through at least one port; and, a check valve coupled to allow fuel flow from the intensifier plungers to the needle chamber and the at least one storage volume, and to block fuel flow in the opposite direction; all of the foregoing being within a single fuel injector assembly. a needle chamber; a needle in the needle chamber having a first position blocking fuel injection and a second position allowing fuel injection; an intensifier having an intensifier piston and a plurality of intensifier plungers for intensifying a fuel pressure responsive to an intensifier actuation fluid pressure, wherein the intensifier is coaxial with the needle and the intensifier plungers are distributed around the axis of the intensifier piston and the needle; first valving coupled to control intensifier actuation fluid over the intensifier piston; second valving responsive to a needle actuation fluid to controllably; maintain the needle in the first position against an intensified fuel pressure in the needle chamber, or allow the needle to move toward the second position responsive to intensified fuel pressure in the needle chamber; a needle control piston, the second valving controlling needle actuation fluid pressure on a surface of the needle control piston to move the needle to the first position when needle actuation fluid pressure is applied to the surface of the needle control piston, and pressure in the needle chamber forcing the needle toward the second position when needle actuation fluid pressure is not applied to the surface of the needle control piston, at least one intensified fuel storage volume coupled to the needle chamber through at least one port; and, a check valve coupled to allow fuel flow from the intensifier plungers to the needle chamber and the at least one storage volume, and to block fuel flow in the opposite direction; all of the foregoing being within a single fuel injector assembly.