Gasoline Direct Injection (GDi) Systems

Demand for gasoline direct injection (GDi) technology is increasing - several research firms project the global GDi market will grow in excess of 10 percent annually through 2026. And when paired with electrification technologies, growth is forecast well into the next decade. As a leading OE manufacturer, Delphi is perfectly positioned to help you take advantage of this exciting opportunity. In addition to the latest generation OE technology, our GDi service program includes the OE parts, tools and know-how to service this fast-growing, high-performance technology.

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Raising the bar with OE technology

Our industry-first Multec® 14 (M14) 350-bar pressure injection system raises the bar, taking injection pressure from 200 to 350 bar. By injecting smaller droplets into the combustion chamber faster, the latest generation system delivers fewer hydrocarbons and particulate emissions – up to 70 percent - and increased fuel savings. And if that’s not enough, we’re already working on a 500 bar solution.

OE expertise in the aftermarket

We bring our OE expertise to the aftermarket too. Our GDi service programme features our award winning Multec® GDi multi-hole fuel injectors for optimised fuel delivery and combustion, low noise GDi high pressure fuel pumps and service kits, giving you access to OE parts for a high-quality, competitive service. Understand more about the common service issues with GDi.

More than parts

We also offer a comprehensive electronic and hydraulic diagnostic solution including our proven on-board DS diagnostic tool, a high-pressure diagnostic kit, HD3000, allowing technicians to safely set and electronically control any pressure test point up to 3000 bar and a wide-ranging low-pressure tester, LP35.

Training from the OE experts

Want to learn more about GDi servicing? Our range of one day specialist training courses combines theory with practical, on-vehicle exercises and cover key topics such as component operation, common systems and faults, using high pressure gasoline and more. Giving you the skills and know-how to service the latest GDi equipped vehicles.

The Delphi Difference

100 years of OE experience, supplier to the world’s top automakers
OE heritage and knowledge built into every aftermarket part
Comprehensive portfolio for a wide range of vehicles and model years
Streamlined SKUs for easy inventory management
Support through tools, tips and training

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2 min read

Hard or non-start problems due to fuel injection system

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General Maintenance and Tips Diagnostics & Test Equipment Fuel Injection Diagnostic Fuel Systems Technical Tip DIYers Technicians 2 min read

Resource Highlights

In this article, you will find out about Hard or non-start problems due to fuel injection system.

Summary

Some 2.0 HDi vehicles may develop hard or non-start problems which can be attributed to the fuel injection system.

This may be due to failures in either the low pressure feed to the high pressure pump, or the high pressure pump itself.

Resolution

The fault codes should be first read using the DS diagnostic kit and if pressure related faults are recorded the following process will aid repair.

For the low pressure system a feed pressure of at least 2.5 bar is required at the high pressure pump inlet. This can be measured with a low pressure gauge on a “T” connector fixed to the HP pump inlet under cranking conditions.

If the pressure is low or non-existent then the low pressure system must be repaired first. Common reasons for failure are:

Blocked fuel filter / fuel contamination
Failure or blockage of the low pressure supply pump
Wiring issues to the low pressure pump

If the reason for failure is fuel contamination then the whole system must be cleaned out, and this may include major service of the high pressure components as well.

If adequate pressure is available from the low pressure circuit then the high pressure circuit should be checked for efficiency. A minimum pressure of 117bar is required to affect an engine start. This can be checked through the diagnostic port and by reviewing the dynamic data referring to rail pressure.

It may be possible that the data supplied is inaccurate due to a failure of the rail pressure sensor, but not necessarily creating a rail pressure sensor fault code in the process. It is also possible that low pressure is attributable to a leak in the system which is not visually detectable.

In order to confirm the high pressure pump efficiency in a ‘stand alone’ condition the Delphi sealed rail kit (YDT278) can be used to determine the pumping efficiency of the high pressure pump. If a pressure issue is found on the pump, then this is a serviceable item via the local Diesel Centre or Technical Partner. Note the pressure parameters in the information pack supplied with the sealed rail kit.

If the pump sealed rail test is okay then further investigation into possible leakage via the rail, high pressure valve, or injectors will be necessary. For Injectors a back leakage check using the sealed rail kit is possible, and again these are serviceable items via the Technical Partner.

If both low and high pressure requirements are met, poor and non-start situations should be avoided.