CAMSHAFT...................................................................................................................................................................A3

20

Description

21

19

22

5

161vfm05

Nomenclature

5 Injector pump. 19 Fuel filter. 20 Line between feed pump and filter. 21 Line between fuel filter and injector pump. 22 Fuel pump.

Operating principle

Fuel is drawn from the fuel tank by the camshaft-driven fuel pump located on the engine block. The fuel then passes through the filter(19) to the transfer pump suction chamber inlet. The transfer pump (vane type) is located inside the injector pump and its role is to raise fuel pressure as a function of increases of engine rpm. The fuel then arrives at the valve that regulates the pressure within the injector pump. The distributor piston later raises this pressure and sends the fuel to the injectors via the outlet connector. Excess fuel is recovered and returned to the tank.

Fig.4