It is very hard to find info on the VW injector pumps, and almost
impossible to find pictures and rebuild instructions. The pump
can be taken apart and put back together by the amateur.
The fuel injection pump meters the appropriate amount of fuel
under extreme pressures, at precise time to the
The VE Rotary pump, made by Bosch GMBH is used in the VW diesels and many other small diesel engines. VW stands for Verteiler, which is a German word for distributor. The other common kind of injection pump is the inline pump. The VE "Verteiler" has one fuel metering plunger, instead of a plunger for each cylinder.
The Bosch VE is a complex design. The fuel enters the pump through the vane
pump. This is located close to the front of the pump. (On the left side)
The VW diesels
had no other fuel pump than the injection pump, so the vane pump in the injector
pump acts like a vacuum pump. The rotor in the VE pump rotates
axially in the pump and acts as a plunger. The causes the high pressure in
the pump and meters the fuel to the injectors.
The cam disk is what causes the rotor to move in and out. The cam disk rides on rollers. It has the same number of rollers as lobes and corresponds to the number of cylinders on the engine.
Functions of the diesel injection pump are:
Injector TimingThe injector pump controls the timing of the diesel injection. The timing is varied by the pressure of the vane pump or by the cold start advance lever.
Turbo Boost AneroidThe turbo boost aneroid delivers more fuel when the engine is producing turbo boost pressure.
GovernorA mechanical governor limits the maximum RPM of the engine.