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A new type of diesel fuel injection uses a simple, medium-pressure, common-rail system with pressure intensifier and accumulator type unit injectors with direct electronic control to achieve high performance at low cost. The desirable features of high injection pressures with quantity and timing controlled directly by microprocessor are attained with a simple unique system. Data are presented on performance, efficiency, emissions, and relative cost. It is concluded that electronically controlled high pressure injection offers a practical and economical solution for efficient combustion in diesel engines.