Common Rail Fuel Pump

Categories: Technology News

What is a common rail?

Common rail is a fuel injection system found in modern diesel engines. Common rail systems provide a level of flexibility which can be exploited for class leading emission control, power and fuel consumption.


1.What is a common rail fuel pump?


Common rail direct fuel injection is a direct fuel injection system built around a high-pressure (over 2,000 bar or 200 MPa or 29,000 psi) fuel rail feeding solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors (or pump nozzles).

2. How does a common rail high pressure fuel pump work?


The pump compresses the fuel and feeds it via a high-pressure pipe to the inlet of the rail, which acts as a shared high-pressure reservoir for all injectors – hence the name ‘common rail. ‘ From there, the fuel is distributed to the individual injectors, which inject it into the cylinder’s combustion chamber.

3. What happens when a diesel pump fails?


Symptoms of a failing fuel pump may include: Jerks or sputters at high speeds. Power loss on acceleration. Power loss while driving up a slope.


4. What are the symptoms of a failing high pressure fuel pump?


Symptoms of a high-pressure fuel pump failure are:

  1. Delayed start of the engine.
  2. Hesitation or sputtering in acceleration between 2000 RPM to 4000 RPM.
  3. High engine temperatures.
  4. Vehicle stalling due to exertion or temperature.
  5. Fuel pressure gauge reading low measurements.
  6. Poor gas mileage.

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