A4 Quattro Wagon L4-1.8L Turbo (AWM) (2001)
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Open threaded connection (arrow) and catch exiting fuel using a rag.
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Connect VAG1318 pressure gauge in supply line using adapters 1318/11,1318/12 and 1318/13.
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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.
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Specification: about 3.5 bar positive pressure
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Disconnect vacuum hose at fuel pressure regulator.
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Fuel pressure must rise to about 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.