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Fuel Injectors (GDI)

What does the Technician need to know about Direct Fuel Injection (GDI) fitted to a motor vehicle?

Gasoline Direct Injection (GDI) systems are commonplace in the modern automotive industry. Just like Electronic Fuel injection (EFI) replaced Carburettors years ago, Direct Injection systems are the new standard. The major advantages of a GDI system is the increased fuel efficiency allowing manufactures to downsize engines and reduce emission levels.

Like many systems, even modern direct injection, parts fail and before working on GDI systems technician should be aware of the dangers and changing component technology.

It is common for GDI injectors to be triggered by voltages as high as 120V, and technicians should never disconnect injector connectors during operation. Fuel pressure is another area of caution, fuel line pressures can be in excess of 200 Bar. Fluid at these pressures can cause serious skin or eye injuries. Procedures outlined by the manufacturer on lowering residual fuel pressure safely should be followed.

GDI Injector information – Bosch HDEV5

A multi hole, electrical magnetic solenoid injector (not Piezo type) that is used on system pressures of up to and exceed 200Bar.

This type of injector may be located at the side or central of the combustion chamber, depending on the crown design of the piston. An average Injector Pulse Width is approx. 0.4µs and the Injector winding resistance. cold would be approx. 1.5 ohms.

Direct Injection Pumps (DIP)

Generally driven by the camshaft and may utilise Roller, Follower or Bucket type drive that contacts cam lobe.

Some V configured engines can utilise 2 DIP units, 1 per bank, and contain an electric pressure regulator solenoid that is controlled by the PCM.

Most also contain an internal pressure relief valve. A “clicking” sound may be audible during operation. Utilising a suitable scan tool can assist with verifying if DIP is functioning correctly.

The Premier Auto Trade Fuel range includes almost 20 GDI Fuel Injectors (INJ), covering over 480,000 vehicle applications in Australia and NZ.

When you supply and fit products from Premier Auto Trade you can expect a product designed and tested to the vehicle manufacturer’s specifications offering OE form, fit and function. Premier Auto Trade distributes products throughout Australia via a network of specialised resellers and leading automotive groups.



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