A4 Quattro Cabriolet V6-3.0L (BGN) (2005)
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Unscrew fuel hose from connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and unscrew
union nut -2-.
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Connect V.A.G 1318 Fuel Inj. Pressure Gauge-CIS in supply line using adapters 1318/6 and 1318/7.
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Open shut-off valve of pressure gauge. The lever points in the direction of flow.
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Start engine and let run at idle.
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Measure fuel pressure.
Specified value: 3.8 to 4.2 bar
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Switch ignition off.
Checking holding pressure
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Check for proper seal and residual pressure by observing pressure drop on pressure gauge.
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Specified value with a cold engine: approx. 2.2 bar
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Specified value with the engine at operating temperature: approx. 3.0 bar
NOTE: Pressure increase for an engine at operating temperature due to fuel expansion is normal.
If holding pressure sinks below 2.2 / 3.0 bar positive pressure:
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Start engine and let run at idle.