The Only Difference Between The High-pressure Injection Pump Of

  •   The mechanism, which is abbreviated as a High Pressure Injection Pump, is part of the fuel system of a diesel engine, but there are also models for gasoline power units. The only difference between the fuel pump of a diesel engine is that the pressure it generates is much higher than its gasoline counterpart. The reason for this is the fundamental features of the unit's operation. In the cylinders of a diesel engine, air is first compressed to such an extent that it heats up to the ignition temperature of the fuel.

      When the piston reaches top dead center, the nozzle sprays fuel and it ignites. The injector has to overcome enormous pressure. For the system to work properly, the pump must create a higher head than in the cylinders.

      In addition to the mentioned function, the pump must also supply fuel in portions, depending on the operating mode of the power unit. This parameter is determined taking into account the rotation of the crankshaft. In a modern car, this process is controlled by an electronic control unit.


      This device was first developed in the 1930s by Robert Bosch. In passenger cars, injection pumps began to be actively used in the second half of the same decade.

      Since the first gasoline engines were equipped with carburetors, only diesel units needed such a mechanism. Nowadays, gasoline engines with a direct injection system also have a pump of this type (the carburetor is already extremely rare - only in older generation cars).

      Although the principle of operation of the pump has remained practically unchanged, the mechanism itself has undergone multiple upgrades and improvements. The reason for this is an increase in the environmental standards and performance of the internal combustion engine. Initially, a mechanical Injection Pump Machine was used, but it was not economical, which led to volumetric emissions of harmful substances. Modern electronic pumps show excellent efficiency, which allows transport to fit into the framework of environmental standards and satisfy modest drivers.