Fuel System - Rattle Noise From Left Rear Of Vehicle

20 R8 V10 Spyder rattle noise from left rear

20 12 22

2027912/5

June 13, 2012.

Supersedes Technical Service Bulletin Group 20 number 12 - 19 dated January 24, 2012 for reasons listed below.





Affected Vehicles





Condition
The customer may complain of a faint tapping sound coming from the left rear of the vehicle as heard when sitting in the drivers seat. The customer may state the sound occurs at certain engine RPM. It is consistently reproducible when lightly feathering the throttle when the vehicle is stationary and sound making accessories such
as the air conditioning fan and radio are turned off.

Technical Background

Actuation of a pressure relief valve inside the in-line fuel filter can cause a tapping sound audible inside the passenger compartment. The valve actuates when fuel demand decreases, for example when quickly lifting off the throttle pedal.





The in-line fuel filter is secured in a bracket which is mounted on a structural member at the left rear of the vehicle, behind the drivers seat (Figure 1). Normal operating sound of the filter can be transmitted to the passenger compartment.

Production Solution





An acoustically optimized fuel filter has been implemented in production.

Service

1. Do not attempt any repairs at this time. The optimized filter has been production implemented, and a service part will soon become available through the normal part supply channels.

2. This TSB will be updated as soon as the optimized service part is available.

3. Please explain the condition to the customer, and schedule the repair once the service part is available.

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.