Motronic MED 9.1
Transfer Fuel Pump (FP) G6 and the
Fuel Level Sensor G
TheTransfer Fuel Pump and the Fuel Filter are
combined in the FuelTransfer Unit. The FuelTransfer
Unit is located in the fuel tank.
Operation
TheTransfer Fuel Pump transfers the fuel in the low
pressure fuel system to the high-pressure fuel pump.
The ECM constantly monitors fuel pressure through
the Low Fuel Pressure Sensor G410. If the fuel
pressure is not adequate to meet current engine
demand, the ECM activates the FP Control Module
J538, which controls theTransfer FP G6 with a Pulse
Width Modulation (PWM) signal.
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Effects of Failure
If theTransfer Fuel Pump fails, engine operation is not
possible.
Fuel Pressure RegulatorValve N276
The Fuel Pressure Regulator Valve is located on the
underside of the High-Pressure Fuel Pump.
The ECM regulates the fuel high-pressure through the
Fuel Pressure Regulator Valve at a level between 507
and 1,450 psi (35 and 100 bar).
Effects of Failure
The ECM goes into emergency running mode.
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High-Pressure
Fuel Pump
N276
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