GF07.16-P-3001P CDI Fuel Low Pressure Circuit, Function

GF07.16-P-3001P CDI Fuel Low Pressure Circuit, Function
- ENGINE 642 in MODEL 203.0 /2, 221.0 /1 up to Model Year 8
- ENGINE 642 in MODEL 209.3 /4, 211.0 /2 /6, 219.3





Shown with OM 642.910
19 High pressure pump
70 Fuel main filter
75 Fuel tank
B50 Fuel temperature sensor
M3 Fuel pump
Y74 Pressure regulator valve
Y76 Fuel injectors
Y94 Quantity control valve

When starting the engine and after engine running is recognized, the CDI control unit (N3/9) actuates the fuel pump (N10/2) fuel pump relay () (model 203, 209, 211, 219) or the fuel pump relay (N10/2kS) (model 221) integrated in the via the rear SAM control unit with fuse and relay module (N10/2kA) which delivers the fuel via the fuel main filter to the high pressure pump. The pressure of the pumped fuel is limited to approx. 4.0 to 4.5 bar via the pressure relief valve integrated in the high-pressure pump, the quantity control valve and the fuel temperature sensor.
The quantity control valve also regulates the supply of fuel to the high-pressure pump, in order to increase engine efficiency and to keep the fuel temperature low.

Leak fuel from fuel injectors is led back before the main fuel filter into the system. The diverted fuel from the pressure regulator valve and the fuel which is not required is led back over the return line to the fuel tank.

For model 211.022 with OM 642.920 and code (494) USA version the fuel main filter is fitted with a fuel filter water level sensor (B76) for water level recognition in the fuel main filter.