A6 Quattro Sedan V8-4.2L (ART) (2000)
Fuel Gauge: All Technical Service Bulletins
Instruments - Fuel Gauge Reading Erratic
20 08 13
2001814/3
December 11, 2008.
Supersedes Technical Service Bulletin Group 20 number 00-02 dated January 26, 2000 to change the title.
90 Fuel Gauge Reading Erratic
Condition
Technical Background
Production Solution
Service
Please review the attached Technical Service Bulletin.
Supersedes T.B. Group 20 Number 00_01 dated Jan 7, 2000
Superseded due to addition of revised sending unit Part Number along with new resistance values, and testing procedure for G169 sending unit. See
revision bars (black bars) on right side of affected pages.
Condition
Incorrect fuel reading on fuel gauge erratic.
May be caused by a malfunction 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".