Kugelfisher as well as the Bosch "zahnradpumpen"...
Look.
1st you need to understand the difference in parameter control.
A fuel injection system can be;
1/Alpha numerically controlled.
This means that the MAIN control parameter is the linear function of the throttle.
In other words..the fuel outlet is proportional to how much you depress the gas.
2/Speed density controlled.
This means that there´s some sort of measurement of the amount of air running into the motor.
Either..as the K,KE and early Bosch "L" units via some sort of flap or..via a so called MAP sensor.(basically a piezo element)
The latter one..will be more "in tune" with the engines relative volumetric needs,while the alpha numericals will be in a way "force fed" with a specific amount of fuel-wherther the engine wants it or not.
The kugelfisher-found on early BMW M10 engines,a VAST array of diesel engines(peugeot comes to mind)is an alpha based proposition.
Bosch pumps...were basically a more advanced variant of the kugelfishers.
In their last stages the Bosch pumps that could be found on certain mercedes models,Porsches asf were even compensated for by mechanical means as far as barometric states,temperature and so on.
A "zahnrad pumpe" by definition is a sort of camshaft that runs small pistons that run in specific displacement cylinders.
At the top of each cylinder there´s a valve that keep the fuel run in one direction.
The pump itself..is driven by a belt off either the cam or the crankshaft.
By the use of an eccenter the amount of horizontal movement of the cam is controlled,and in essence you could say that the fuel displacement is a linear function of how much the cam is moved(each lobe is eliptic and somewhat skewed in apperance for lack of better word)
Anyways.
This movement..is controlled by mechanical means(a control rod)via the throttle valve.
Ergo..the system per se is an Alpha numerical by definition.
The kugelfisher and Bosch in contrast to for instance the Italian Spica are reffed as three dimensional,while the Spica,english tecalamit asf are refed as two dimensional.
(Come to think of it even Ferrari used them in the 50s-amongst others)
A number of yrs back we played around with them all.
The kugel and Boschs on the "S and RS and RSR Porsches as well as rallycross VWs,and the spica..