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7 reasons for direct-injection fuel pump assembly fail

count:1512018-10-06 14:23:17 FROM: Guangzhou Ruixiao Trading Co., Ltd

7 reasons for direct-injection fuel pump assembly fail

Don’t be scared by direct fuel injection diagnostics. In theory, these systems operate on the same principles as port gas injection, but direct injection can inject more specific amounts of fuel into the combustion chamber so the engine can run leaner and more efficient.

The key to immediate injection is a fuel pump assembly. This pump can be precision-machined to generate energy pressure to the rail up to 2, these gasoline pump assemblys are typically driven by a camshaft and are able to vary their displacement and output to match the needs of the engine.
fuel pump assemblys can malfunction and/or Invalid due to several factors. Diagnosing issues with these pumps isn’t too difficult if you know what to look for.

1. Lack of Maintenance

The main destroyer of fuel pump assemblys is a lack of oil changes. Use between the camshaft lobes and the high-pressure pump follower stops the pump from generating enough piston movement. Less movement of the pump means less pressure.
You should always examine the lobes on the camshaft before installing a new and very expensive fuel pump assembly.  but it will never be completely corrected.

2. Wrong Oil

Engine oil must satisfy OE specifications to prevent premature wear on the camshaft and fuel pump assembly follower. Check with your engine oil supplier to discover if an engine essential oil meets the OEM’s specifications. Volkswagen, GM and many other OEMs have oil standards that address put on issues on the camshaft and pump follower.

3. Pressure and Temperature Sensors

While a Invalided sensor cannot cause a pump to Invalid, it can cause you to misdiagnose a fuel pump assembly. Direct-injection systems use pressure and in some cases temperature sensors to help determine position of the high-pressure pump solenoid.
The information generated by these sensors makes for the best possible combustion event, 
These sensors have a ±2% accuracy rate. If the sensors are malfunctioning, they can influence gas trims. If a sensor Invalids or is producing readings outside of set parameters, the system will go into a low-pressure safe mode to avoid damage to the machine.
The simplest way to diagnose sensors is with a scan tool to greatly help interpret the data.

4. Leaks

A direct injector is under a lot of pressure, so leaks can happen. Some leaks may occur when the engine is certainly resting, that will cause severe carbon buildup and a rich fuel reading. Leaks can also result in a longer than normal cranking cycle and possible wear.
Many systems have a specified resting pressure. This is designed to keep a specific amount of pressure in the system when the engine is turned off. Values can be monitored using a scan tool.
Injector balance test and leakdown test are usually included in a enhanced or factory scan tool. These checks can help to spot a leaking injector or pump.

5. Older Calibrations, Reflash Required

As engineers squeeze every bit of energy out of a droplet of energy, every element in the machine is operating upon a razor’s edge of driveability problems. Sometimes they get it wrong and they don’t find out until a direct-injection system is usually in the field and racking up warranty claims.
There is a direct relationship between pump pressures, camshaft position and pressure solenoid position. These elements along with injector pulses could be calibrated to give the best performance and component lifestyle.
If you are diagnosing a driveability problem on a direct-injection vehicle or replacing a high-pressure pump, make sure the ECU has the newest calibration. Newer calibrations can help solve wear complications and driveablity problems, and may save you from changing the pump.

6. Energy Pump Pressure Solenoid

 When this solenoid Invalids, it will be in a low-pressure establishing.

7. Ignoring the Signs

Some people like to drive with their check engine light on. They believe it will go out if they put better gasoline in the tank, but we all know that this is not true.
A direct-injection engine that has a high-pressure pump issue will get into a limp or low-pressure mode. In this mode, the in-container pump will take over and the injector open time will increase.

When direct injection is working, the injector is specifically pulsing the injector multiple times to generate the perfect fuel/air mixture. In a low-pressure setting, it is less precise. The car will start and run, but the efficiency will be reduced and the catalyst could be harmed. Engine use can also occur.


If you need to know or buy accessories about the injection system, you can find us.whatsapp/wechat:+86 15622179651 Email:guoziyun9901@gmail.com http://www.rxfuelinjector.com/