Q5 Quattro V6-3.2L (CALB) (2009)
Fuel Gauge Sender: Service Precautions
Fuel Injection System
Before Opening High Pressure Fuel Injection System
CAUTION!
The fuel injection system is divided into a high pressure section (maximum approximately 120 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.
High fuel pressure, reducing
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Connect Vehicle Diagnosis, testing & info. system (VAS 5051B).
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Start engine and run at idle speed.
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Select "engine electronics" in OBD.
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Then select "Measured values".
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Select "Fuel pressure" from the list.
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When the engine is at idle, fuel pressure between 30 and 40 bar is displayed.
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Pry off the cover - 1 - on the left of the instrument panel, for example using the trim removal wedge (3409) - arrow -.