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A fuel injection system includes a plurality of mechanical unit pumps, each of which has a pump outlet. A pressure-intensifying hydraulically-actuated electronically-controlled fuel injector is provided for each of the plurality of mechanical unit pumps. Each of the fuel injectors has a direct contr

A fuel injection system includes a plurality of mechanical unit pumps, each of which has a pump outlet. A pressure-intensifying hydraulically-actuated electronically-controlled fuel injector is provided for each of the plurality of mechanical unit pumps. Each of the fuel injectors has a direct control needle valve and an injector body that defines an actuation fluid inlet, a fuel inlet, an actuation fluid cavity and a fuel pressurization chamber. Each fuel injector also includes a moveable pumping element with a large hydraulic surface exposed to fluid pressure in the actuation fluid cavity, and a small hydraulic surface exposed to fluid pressure in the fuel pressurization chamber. An actuation fluid supply line is provided for each of the plurality of mechanical unit pumps. Each supply line has one end connected to one pump outlet and an other end connected to one actuation fluid inlet of an individual fuel injector.

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1. A fuel injection system comprising:a plurality of mechanical unit pumps, each having a pump outlet; a pressure-intensifying hydraulically-actuated electronically-controlled fuel injector for each of said plurality of mechanical unit pumps, and each of said fuel injectors having a direct control n

1. A fuel injection system comprising:a plurality of mechanical unit pumps, each having a pump outlet; a pressure-intensifying hydraulically-actuated electronically-controlled fuel injector for each of said plurality of mechanical unit pumps, and each of said fuel injectors having a direct control needle valve and an injector body defining an actuation fluid inlet, a fuel inlet, an actuation fluid cavity and a fuel pressurization chamber, and including a movable pumping element with a large hydraulic surface exposed to fluid pressure in said actuation fluid cavity and a small hydraulic surface exposed to fluid pressure in said fuel pressurization chamber; and an actuation fluid supply line for each of said plurality of mechanical unit pumps, and each said supply line fluidly connecting one said pump outlet to one said actuation fluid inlet.