The systems use an individual injection pump mounted on the engine block for each cylinder so it is primarily designed for OHV or "cam in the block" engines. The fuel pumps are driven by an extra camshaft lobe where each pump unit is connected to the injector via a short precise length high-pressure fuel line as opposed to Unit Injector systems which combines both a pump and an injector element 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.
Known commercial vehicles manufacturers using the system are Mack (discontinued), Liebherr,Mercedes-Benz, its subsidiaries Freightliner and Western Star, by Detroit Diesel made MBE 4000 engine.
- R. Bosch. "UPS Unit Pump Systems". Retrieved 5 December 2009.
- Diesel Fuel Injection. Germany: Robert Bosch GmbH. 1994. p. 147. ISBN 1-56091-542-0.
- Delphi. "Delphi electronic unit pump". Retrieved 5 December 2009.
- Liebherr. "Liebherr Diesel engine D934 L A6" (Web). Retrieved 17 March 2014.
- Freightliner Trucks. "Freightliner business clas M2 line of trucks" (PDF). Freightliner LLC. Retrieved 5 December 2009.
- Freightliner Trucks. "Freightliner Columbia" (PDF). Retrieved 5 December 2009.
- Detroit Diesel. "MBE 4000 engine". Retrieved 5 December 2009.
- Western Star Trucks. "MBE400". Retrieved 5 December 2009.
- Unit pumps
- Delphi launches Electronic Unit Pumps
- Diesel engines: A brief overview
- Freightliner Adds MB Power for Heavy-Duty Trucks
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