Fuel Gauge Sensor, Location/Task/Design/Function

Fuel Gauge Sensor, Location/Task/Design/Function




89/1 Lever-type sensor
89/2 Potentiometer
89/3 Sliding contacts
B4 Fuel level sensor (except model 140)

Fuel gage sensor - location
The fuel gage sensor is inserted into the fuel tank by means of a bayonet lock

Fuel gage sensor - task
Determining the fuel level in the fuel tank

Fuel gage sensor - design
The fuel gage sensor (B4) is a lever-type sensor with sliding contacts (potentiometer)

Fuel gage sensor - function
The resistance of the fuel gage sensor (B4) is analyzed in the the fuel gage electronics. Example model 208:
Low resistance = fuel tank empty
High resistance = fuel tank full

Note: If there is an open circuit in the wiring the fuel gage in the instrument cluster indicates empty; the fuel reserve warning lamp (A1e4) does not come on.