What is unit pump?

A unit pump is a type of fuel injection pump used in diesel engines. It is a self-contained unit that includes a high-pressure fuel pump, a mechanical or electronic control system, and an injector. The unit pump is mounted directly on the cylinder head and supplies fuel with high-pressure injection into the combustion chamber.

Unit pumps are known for their high performance and efficiency, as they provide accurate fuel delivery and reduce emissions. They are also compact and easy to service. However, they require higher pressure fuel lines and more complex electronics than traditional injection pumps.

Unit pumps are commonly used in modern diesel engines found in heavy-duty trucks, buses, and construction equipment. Some common brands of unit pumps include Bosch, Delphi, and Denso.