Diesel injection pump: replacement and selection

When and why it is necessary to replace diesel injection pump

On the average, the diesel injection pump serves for 200,000 – 300,000 kilometers of mileage. The component requires replacement if the pump barrel/plunger assemblies, control rack teeth or delivery valves are worn out. Also the pump can break down because of control rack jamming, disconnection from the pressure regulator, plunger levers clamps loosening.

Signs of fuel injection pump replacement necessity are traces of fuel leakage from the pump, loss of mounting position of the timing belt or chain, excessive fuel consumption, troubled engine start, its unstable and too noisy operation, loss of power.

The fuel injection pump is replaced in service station conditions only. Ingress of even smallest dirt particles in the fuel line during installation is strictly unacceptable, as it can break down not only the component, but the engine as well. Moreover, the fuel supply system should be adjusted after installation of a new part. For this, each injector is adjusted separately with the help of a special tester.

How to select injection pump

The most fuel injection pumps are used in fuel supply systems of diesel engines, but also injection pumps can be found in the direct injection system of gasoline engines. In the latter, pressure is lower than that in components of diesel engines.

By construction, the fuel pumps are divided into: in-line fuel injection pumps, distributor fuel injection pumps, and Common Rail fuel injection pumps. In the in-line pump, supply of fuel into the cylinder is performed with the help of special pump barrel/plunger assemblies; their quantity is equal to that of cylinders.