S6 Quattro Sedan V10-5.2L (BXA) (2007)
Fuel Gauge Sender: Service Precautions
Before Opening High Pressure Fuel Injection System
CAUTION!
The fuel injection system is divided into a high pressure section (maximum approximately 110 bar) and a low pressure system
(approximately 6 bar).
Before opening high pressure parts, e.g. removing high pressure pump, fuel rail, fuel injectors, fuel pipes, etc., reduce the fuel pressure in
the high pressure area to a residual pressure of approximately 6 bar. The procedure for this is as follows.
Special tools, testers and auxiliary items required
‹› Vehicle diagnostic, testing, and information system (VAS 5051B)
High fuel pressure, reducing
-
Connect Vehicle Diagnosis, testing & info. system (VAS 5051B).
-
Start engine and run at idle speed.
-
Select "engine electronics" in OBD.
-
Then select "Measured values" read out.
-
Select measured value block 140.
-
With the engine running at idle, the fuel pressure will be displayed in display field 3.
‹› Specified value: Between 35 and 45 bar
-
Remove right instrument panel cover..
-
Remove fuel pump control module (J538) fuse in the fuse panel with the engine idling, see.