A6 Quattro Sedan V6-2.8L (AHA) (1998)
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Fuel Gauge Sender: All Technical Service Bulletins
Fuel Tank Sending Unit - Diagnosis
Group: 20
Number: 98-01
Date: Sept. 21, 1998
Subject:
Fuel Tank Sending Unit, Diagnosis
Model(s):
A6 Sedan with (All Wheel Drive)
1998-->
A6 Avant with (All Wheel Drive)
1999-->
Condition
Incorrect fuel reading on fuel gauge (erratic).
May be caused by a fault in one of the three fuel tank sending units.
Service
The following overview of the fuel tank sending unit system is provided to gain a better understanding of how the system works.
Determination of fill volume
Within the complex geometry of the fuel tank, three fuel gauge tank sending units are used to signal the fuel level in the tank.
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One or more of the senders for the fuel gauge operate, depending on how full the fuel tank is.
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The three senders for the fuel gauge are connected in series. The individual resistances of the senders are added together to get a "total resistance".
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A microprocessor in the multipurpose instrument panel insert, processes this data.
