This is an example of an injection pump for a diesel engine, with an in-line distributor for four cylinders, with a one pumping element for each cylinder.
The diesel flow rate is regulated by the position of the pumping element, driven by the pump rack connected to the accelerator pedal. Systems of this type remained in operation until the advent of high-pressure electronic injection systems (common rail and pump injector systems), therefore in use until the 1990s. Compared with the CAV type rotary injection pump, the in-line pump had higher performance (higher injection pressures, at a lower rotation speed), mainly used on industrial engines of medium/high displacement or in general on engines with lower rotation speed than the one typical of light vehicles.
