A6 Quattro Wagon V6-3.2L (BKH) (2006)
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Leak Detection Pump Filter: All Technical Service Bulletins
Fuel System - Thumping Noise From Fuel Tank Area
20 07 01
March 5, 2007
2014293/1
Vehicles Affected
Thumping, knocking or popping noise in fuel tank area
Condition
Customer may report thumping, knocking, popping or similar noise emanating from fuel tank area during or shortly after driving.
Technical Background
Filtration element was too fine in the original in-line filter (part number 4F0 201 801 A) for the leak detection pump. In some cases, the filter becomes
obstructed by particulate build-up that impedes tank pressure normalization. This condition leads to nonlinear corrections in tank pressure, thus causing a
thumping noise.
Production Solution
Vehicles produced after the specified VIN break are equipped with an improved filter (part number 4F0 201 801 B).
Service
