RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
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Connect a jumper cable from a Electrical connector test lead set to terminal - 4 - of the fuel delivery unit and to vehicle Ground (GND).
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Remove the fuel filler cap from the fuel filler tube.
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Remove the rear engine cover - arrows -.
CAUTION: Fuel system is under pressure. Before opening system, place clean rags around the connection. Then release pressure by
carefully loosening the connection.
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Disconnect the fuel line at the fuel rail - arrow -.
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Connect a Fuel pressure test set (high pressure) to the fuel line.
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Connect a hose - arrow - to pressure gauge and hold it in the measuring container.
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Open the shutoff valve of the pressure gauge. The lever points in the direction of flow.