What is a Unit Injector?

What is a Unit Injector?

Furthermore, fuel injection systems on the CRDi diesel engines use ‘Unit-Injector’ or the ‘Pump/Injector’. It merges the functions of an injector-nozzle and the injection pump into a single unit. This design consists of an individual pump assigned to each cylinder rather than a common pump used for all cylinders in earlier generation models.

In this system, the pump and nozzle are merged into a single compact assembly which fits directly on the cylinder head. This design eliminates the need for high-pressure fuel pipes. The integral ducts machined directly into the cylinder head supply the diesel. Thus, it helps to eliminate the potential failures of fuel pipes leakages.