For top power and fuel efficiencies for commercial vehicles only: The Bosch unit pump system is a high-pressure pump with separate nozzle holder assembly, providing injection pressures up to 2,200 bar for optimal air/fuel mixture. The main peculiarity of unit pump systems is their design. Like unit injector systems, they use an individual pump for each cylinder. Unlike UIS, however, pump and injection nozzle are not combined into a single unit. They represent two separate devices instead. A short line connects them with one another. Bosch Unit Pump system is expertly engineered for high and optimized engine performance and low fuel consumption.