A8 Quattro Sedan V8-4.2L (BGK) (2006)
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‹› If fuel should escape at the vacuum connection of the pressure regulator during the following pressure test, replace pressure regulator.
Fuel pressure must rise to approx. 4.0 bar positive pressure.
If specified value is not obtained.
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As a test, replace pressure regulator and repeat pressure test.
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If the specified value is not reached again, check Fuel Pump (FP) or supply line for damage (e.g. pinched areas) and replace if necessary.
If specified value is obtained:
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Re-connect vacuum hose.
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Switch ignition off.
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Check for proper seal and residual pressure via pressure drop on pressure gauge.
After 10 minutes, there must be at least 3 bar positive pressure.
If residual pressure sinks below 3.0 bar positive pressure:
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Start engine and let run at idle.
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Wait until pressure has built up, and then switch off ignition. Simultaneously close shut-off valve of pressure gauge (VAG1318) (lever
perpendicular to direction of flow).
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Observe pressure drop on pressure gauge.
