How to

Remove and refit GDI injectors safely

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The removal and replacement of GDI injectors from a diesel engine is a fairly straightforward task. But the injectors’ role in compressing and injecting fuel makes it exceptionally important to get the replacement right, for safety reasons as well as ensuring the correct performance. 

Watch the video guide from one of our expert Delphi technicians as they walk you through the steps involved in refitting GDI safely, including some advice on: 

  • Why GDI systems can pose a safety risk 

  • How to stop tip seals tearing when refitting 

  • How to check for leaks. 

Gasoline Fuel Systems GDI Injections How to Technicians 1 min read

How often do I change GDI injectors? 

GDI systems are typically inspected when a fault is detected, when the driver notices a loss in engine performance, or when the driver is experiencing poor fuel economy. 

Is direct fuel injection the same as GDI?  

GDI stands for gasoline direct injection, which is a kind of direct fuel injection. Unlike multipoint injection systems, GDI uses high pressure fuel injection to fire directly into the combustion chamber. 

What is the pressure for GDI injectors?  

A GDI system operates between 50 and 500 bar. That’s approximately 725 to 7250 psi. At these high pressures, technicians must take extra care when handling components and refitting a GDI system. 

What are some common issues with GDI injectors? 

As well as ensuring the injectors are fitted correctly to avoid issues from the off, GDI engines  can suffer from carbon build-up over time, which can lead to rough running and poor acceleration. 


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