If the high pressure pump works well, but your Car still can’t start, let’s move to next step to check the common rail pipe.
On the common rail, there are one rail pressure sensor, and also one Pressure limiting valve.
The common rail pressure sensor is located on the fuel rail. Its function is to monitor the fuel pressure in the common rail.
Sensor will send signal to ECU to tell if the pressure in the common rail is higher or lower than standard. When ECU receive the signal, it will control the fuel metering valve( Actuator) to supply less and more fuel into the common rail. Thus the pressure in the common rail will be control by ECU into a normal range.
Fig. 1 shows a typical common rail pressure sensor.
Pressure limiting valve is to protect a common rail fuel injection system from overpressure.
If the the pressure in the rail is too high, it will push the limiting valve, make it open, so that the fuel will flow into the fuel tank from the pressure limiting valve and oil-reture pipe.
Normally, there won’t be fuel in the oil ruture pipe, because the pressure is in the common rail is been controlled well. So when checking the the engine, you can disassemble the scew on the oil reture pipe, to see there there is fuel spraying. That means the pressure in the common rail is lower than stardard to start the car. The common condition is Pedal to the bottom, the maximum speed is 1500rpm.
Fig. 2 shows a typical common rail pressure limiting valve
Here are some common rails for your reference：
3 tips for checking the fuel metering valve
Thank you very much for reading, more maintenance articles please pay attention to our website wwwjyhydiesel. com
Email: [email protected]
All right reserved, any unauthorized reproduction or transfer is prohibitted
This actually answered my drawback, thank you!
Make a more new posts please 🙂
Hi there to every body, it’s my first visit of this weblog; this blog includes
amazing and actually good stuff in support of readers.
It’s perfect time to make some plans for the longer term and it is time to be happy. I have read this put up and if I may just I wish to suggest you some attention-grabbing things or tips. Maybe you can write next articles regarding this article. I want to read even more things approximately it!
Please keep writing such nice things.
Very nice things.
How to check common rail pipe if there is a problem for you car – JYHY DIESEL
Generally I do not read article on blogs, but I wish to say that
this write-up very forced me to try and do so! Your
writing style has been surprised me. Thanks, very nice post.
Hola, quería saber tu precio..