Fuel Gauge

This page contains data for testing fuel gauges and tank sender units on various models.
This is not a complete set of data as this type of information is not readily available.
We've collected these figures over time to help ourselves and others.

Created: 10. 05. 2002
Updated: 28. 06. 2003

Testing the the tank sender unit

The sender unit has to be removed from the fuel tank in order to carry out the following tests. Slowly move the float up and down over its entire range. A gradual change in resistance should occur. Any open or short circuit during the movement is not acceptable. We have tested several new units and made notes of the resistance values in the fully down, center and fully up position. These values differ slightly from vehicle to vehicle. Therefore a slight deviation from the stated resistance does not automatically mean a unit has to be condemned.
Use the figures below as a guide and consider all other possible factors carefully.

 
Float position verses resistance.
All 306 Top30Ω
Middle160Ω
Bottom300Ω
 
Float position verses resistance.
206 full multiplexed
small pump
Top60Ω
Middle170Ω
Bottom350Ω
 
Float position verses resistance.
206 full multiplexed
large pump (1 pipe)
Top50Ω
Middle220Ω
Bottom350Ω
 
Float position verses resistance.
206 full multiplexed
large pump (2 pipes)
Top50Ω
Middle200Ω
Bottom350Ω

Resistance verses gauge reading
206 pre multiplex Full15Ω
½150Ω
¼220Ω
Low (light on)
300Ω
Empty (light on)325Ω
Float position verses resistance.
206 pre multiplex Top14Ω
Middle165Ω
Bottom340Ω
 
Resistance verses gauge reading
406 D8 Full
¾45Ω
Low (close to red)180Ω
Empty (light on)220Ω
Float position verses resistance
406 D8 Top
Middle150Ω
Bottom276Ω
 
Float position verses resistance
406 2000
Petrol and Diesel
Top50Ω
Middle200Ω
Bottom347Ω
 
Resistance verses gauge reading
307 Full (60 litres gross)56Ω
½160Ω
Empty (1 litre gross)305Ω

 

Checking parameters and configuration with DIAG 2000

On multiplexed vehicles the parameters can be read with DIAG 2000. See the example parameter screen below.
There is also a very important configuration setting for the fuel gauge. Always set the configuration in BSI named "Mercosur fuel gauge" to absent. A wrong seting will lead to false and erratic readings on the fuel gauge.

 
Instrumentation/measurements
vehicle type: 206VIN number: VF32ANFUR42117274
familie: BMFControl unit: BSI
Low fuel level info :absent
Gross fuel level - litre(s):5.3
Filtered fuel level - litre(s):5.08
Fuel level on instrument panel - litre(s):9.89
Fuel gauge impedance - ohm(s):277

 


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