A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Open shut-off tap on pressure gauge. Lever points in direction of flow.
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Start engine and run at idle speed.
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Measure fuel pressure.
Specification: approx. 4.0 bar positive pressure
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Switch ignition off.
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Check for proper seal and residual pressure by observing pressure drop on pressure gauge.
After 10 minutes there must be a residual pressure of at least 2.5 bar.
If the residual pressure drops below 2.5 bar:
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Start engine and run at idle speed.
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Wait until pressure has risen, then switch off ignition. At same time, close pressure gauge pressure gauge (V.A.G 1318) shut-off tap (lever at right
angle to direction of flow) - arrow -.
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Observe pressure drop on gauge.