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Fuel tank pressure sensor - location/task/function - GF47.30-P-4032AM

MODEL 211, 219 with ENGINE 113.990 with CODE (494) USA version 

MODEL 215, 220 with ENGINE 113.991 with CODE (494) USA version 

MODEL 230 with ENGINE 113.992 /995 with CODE (494) USA version up to Model Year 2008 

MODEL 463 up to 31.5.12 with ENGINE 113.993 with CODE (491) USA version 

Shown on fuel level sensor (B4) from models 215, 220 

Fig 1: Identifying Fuel Tank Pressure Sensor
G07873647Courtesy of MERCEDES-BENZ USA
  Fuel tank pressure sensor position The fuel tank pressure sensor is located at the top in the fuel level sensor.  
Models 211, 219 GF47.30-P-4032-01T
Models 230, 463 GF47.30-P-4032-01RM 
  Fuel tank pressure sensor task The fuel tank pressure sensor detects the pressure inside the fuel tank for testing the leaks in the fuel system (leak test).  
  Fuel tank pressure sensor function The fuel tank pressure sensor detects the internal pressure of the fuel tank and issues a corresponding voltage signal to the ME-SFI [ME] control unit (N3/10).
The voltage supply of 5 V is comes directly from the ME control unit.
The measuring range extends from approx. -50 mbar to approx. +30 mbar.