Fuel System - Thumping Noise From Vehicle Rear
20 08 042017230/3
November 3, 2008. Supersedes Technical Service Bulletin Group 40 number 08-10 dated October 31, 2008 for reasons listed below.
Vehicle Information
Condition
42 Thumping noise from the rear of the vehicle
The customer complains of a faint noise coming from the area of the fuel tank in the rear of the vehicle. The noise can be described as a thumping noise that is sporadically audible at idle and when cabin noise is minimal.
Technical Background
This faint noise is generated (in particular conditions, while the diagnosis of the evaporative emission system is in progress) by the slight expansion and contraction of the fuel tank due to the change in its internal pressure.
Production Solution
No changes.
Service
1. Explain to the customer that the occasional thumping noises in the area of the fuel tank are part of normal operation and are not indicative of any malfunction.
2. If the customer is especially sensitive to the noise, contact the Technical Assistance Center.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.