S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Connect an assisting hose - arrow - to pressure gauge and hold it in a measuring container.
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Open shut-off valve of pressure gauge.
‹› The lever points in the flow direction.
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Bleed fuel system by pressing remote control briefly.
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Close shut-off valve of pressure gauge.
‹› Lever stands perpendicular to direction of flow - arrow -.
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Hold the switch of the remote control until no more pressure increase is observed on the fuel pressure gauge.
‹› Specified value: approximately 5.5 bar (4.5 to 6.5 bar) positive pressure
If the specification is not obtained:
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Check the fuel pump delivery quantity.
Checking residual pressure:
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Check for leaks and residual pressure by observing pressure drop on pressure gauge.
‹› After 10 minutes there must be a residual pressure of at least 3 bar.
If the residual pressure drops below 3 bar:
‹› Check connection between fuel pressure gauge and fuel line for leaks.