Unit injectors: precision injection for optimum engine performance

A unit injector or pump injector is a pump and injector in one. Technical ingenuity that is used by various manufacturers in the passenger car and truck industry, partly because of its high reliability combined with very high achievable injection pressures. Pump injectors build up their own pressure and deliver the fuel into the cylinders with great precision. With the right timing and atomisation, together with the oxygen present, they ensure optimum combustion. An important component therefore, the load on pump injectors is high. A big advantage is that they do their work under the valve cover in the engine oil, allowing the lubrication to do its job. But strict environmental requirements place high demands on pump injector technology. It is therefore easy to imagine that, after a long time, the operation is no longer optimal and replacement is required. Many pump injectors are standard stock in our own warehouse or can be offered at short notice. We only supply original products.

Possible causes unit injector failure:

  • External contamination
  • Short circuit in the coil
  • Possible electrical control disrupted
  • Normal wear and aging
  • Lubricating properties of the fuel deficient
  • Thermal overload

Total 203 products in group unit injectors

Unit Injector System 0414701056
Robert Bosch
Unit Injector System 0414701057
Robert Bosch
Unit Injector System 0414701058
Robert Bosch
Unit Injector System
Unit Injector System 0414701059
Robert Bosch
Unit Injector System 0414701061
Robert Bosch
Unit Injector System 0414701062
Robert Bosch
Unit Injector System 0414701063
Robert Bosch
Unit Injector System
Unit Injector System 0414701064
Robert Bosch
Unit Injector System
Unit Injector System 0414701065
Robert Bosch
Unit Injector System 0414701066
Robert Bosch
UNIT INJECTOR SYSTEM 0414701067
Robert Bosch
Unit Injector 0414701068
Robert Bosch
Unit Injector 0414701070
Robert Bosch
Unit Injector 0414701072
Robert Bosch
Unit Injector 0414701076
Robert Bosch
Unit Injector 0414701080
Robert Bosch
UNIT INJECTOR SYSTEM 0414701082
Robert Bosch
UNIT INJECTOR SYSTEM 0414701083
Robert Bosch
UNIT INJECTOR SYSTEM 0414701084
Robert Bosch
UNIT INJECTOR SYSTEM
Unit Injector 0414701092
Robert Bosch
Unit Injector
Unit Injector 0414701093
Robert Bosch

Only replace the faulty pump injector or all of them anyway?

In principle, replacing only the defective one is sufficient. If the differences between them are too great, it may be better to replace more than just the defective one. Some injectors may also be on the verge of rejection. We then recommend replacing these as well to avoid a follow-up repair in the (short) term.

To guarantee proper operation, it is very important to carefully follow the manufacturer’s installation instructions. Clean work is an absolute necessity. Naturally, any cause of injector failure must be eliminated prior to installation.