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 programme includes the OE parts, tools and know-how to service this fast-growing, high-performance technology.

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Delphi OE technology innovations

Our leading-edge 350 bar pressure gasoline direct 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.

GDi maintenance

With the launch of the Hartridge Excalibur GDi Master, Delphi is now expanding its GDi service program offering in North America to include GDi and multiport gas fuel injector testing equipment. The Excalibur GDi Master is capable of providing up to 250 bar, and powerful flow and injection per minute rates allow it to test coil and piezo injectors of both GDi & PFI technology types.

GDi training from the OE experts

Delphi is a leading Tier 1 supplier GDi systems to global OEMs, and is committed to supporting the aftermarket with that OE experience and know-how. We offer multiple GDi specific training classes, an on-demand technician support hotline staffed by ASE certified technicians, and a full line of GDi high pressure fuel pumps. Contact us to learn how to sign up.

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4 min read

Hard or non-start problems due to fuel injection system

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Diagnostics & Test Equipment Fuel Injection Diagnostic Fuel Systems General Maintenance and Tips Technical Tip DIYers Technicians 4 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.