The fuel gauge system consists of: 1 - instrument scales with a dimetallic detail; 2 - sensors; 3- "masses"; 4 - float; 5 - battery; 6 - ignition switch.
Possible malfunctions
There may be the following reasons for incorrect readings.
If the level is too high or too low, then the voltage regulator is defective or the float arm is bent.
If there is no reading, then the fuel gauge or gauge is defective. If there is no fuel and temperature reading, or the reading is incorrect, the cause may be a faulty voltage regulator. This must be set accurately.
Fuel Level Sensor Adjustment
In case of incorrect readings due to a bent float, the fuel sensor must be removed.
When the float arm is bent upwards, the reading decreases; downward bending increases the reading.
Checking the fuel sensor
Open access to the sensor. Remove wires.
Connect the wires together.
Briefly switch on the ignition. If the arrow deviates to the side) ' "Voll" ("Full"), then the fuel level sensor has a defect.
If the arrow does not move, then either the purple-black wire leading to the instrument panel is open, or there is a defect in the board or in the pointer.
Read about pointer checking in the section "Instrument Testing Instructions" this chapter.
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