This is an example of an injection pump for a diesel engine, with an in-line distributor for four cylinders, with a pumping element for each cylinder.
The diesel flow rate is regulated by the position of the pumping element, driven by the pump rack. 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 between the 1960s and 1990s. This type of pump had higher performance (higher injection pressures, at a lower rotation speed) than the CAV type pumps, generally used on industrial engines of medium/high displacement or in general on engines with lower rotation speed than the one typically used in light vehicles.
