Unit pump

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Please improve this article if you can. (January 2008)

The Unit Pump system is a modular high-pressure diesel injection system, which is closely related to the Unit Injector system (UI), and is designed for use in commercial vehicle diesel engines.

Both systems use an individual injection pump, driven by an extra camshaft lobe for each engine cylinder, where each pump unit is connected to the injector via a short high-pressure fuel line. A Unit Injector however combines both a pump and an injector in a compact unit. Both systems feature electronically-controlled fuel solenoids for precise timing and the injection of fuel quantity is variably adjusted for each cylinder.