gf4750p2020mor

Component description for fuel pressure sensor

Type gf · topic 47.50 · version 0101 · 2008-11-27

Applies to: ENGINE 275.9 in MODEL 230.4 as of model year 2009 / AEJ 08 model refinement package

Where it sits

Function group 1 Engine › 47 Fuel system, powertrain energy supply › 47.50 Sender, feeler, sensors — Series 230 (models 4**)

Also applies to engines/gearboxes: 275 9**

GF47.50-P-2020MOR

Component description for fuel pressure sensor

13.11.08

ENGINE 275.9 in MODEL 230.4 as of model year 2009
/ AEJ 08 model refinement package

Component description for fuel pressure sensor

P07.61-2866-01

View of the underfloor (shield removed) (for engine 275.954/81)

B4/7 Fuel pressure sensor

Arrow: Connector

Location

The pressure sensor is located in the LH underfloor in front of the rear axle.

Component description for fuel pressure sensor

P47.50-2087-11

View of fuel tank at the front (for engine 275.983 with code (P99) Special model "AMG Black Series")

B4/3 Fuel tank pressure sensor

B4/7 Fuel pressure sensor

Location

The fuel pressure sensor is located above in the fuel filter housing.

Task

The pressure sensor detects the fuel pressure (absolute pressure) in the fuel line to the fuel distribution rail.

The fuel pressure is evaluated for requirement-oriented actuation of the fuel pump (M3).

Function

The fuel pressure is measured by a capacitive measuring element integrated in the pressure sensor.

When fuel pressure increases, the gap between the capacitor electrodes decreases. The capacitance, and therefore the signal voltage, thus increase in proportion to the fuel pressure.

The signal voltage serves the fuel system control unit (N118) for engine 275.954/81 or the ME-SFI [ME] control unit (N3/10) for engine 275.983 code (P99) Special model "AMG Black Series" as information about the fuel pressure.