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In order to meet the increasingly stringent worldwide emissions legislation with the lowest possible fuel consumption, DAF Trucks N.V. will be fitting an electronically-controlled pump-pipe-nozzle (PLD) fuel injection system on its new heavy-duty diesel engines. In this system, the pump elements are grouped together in a separate housing, the UPEC (Unit Pump Electronically Controlled) housing, that will take the position of the current mechanical in-line pump. This results in an injection pipe length comparable with the pipe length of conventional FIE systems, which is rather extreme for PLD systems. Early calculations based on a one-dimensional hydraulic model of a single PLD element have shown that the performance characteristics of the UPEC system can match those of a system with shorter pipes, whilst retaining the present layout of the cylinder block. This also maintains the flexibility to adapt to the FIE requirements for the following steps in emission legislation.