A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000)
If residual pressure sinks below 2.5 bar positive pressure:
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Start engine and let run at idle.
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Wait until pressure has dropped, and then switch off ignition. Simultaneously close shutoff valve of VAG1318 pressure gauge (lever perpendicular
to direction of flow -arrow-).
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Observe pressure drop on pressure gauge.
If pressure does not drop now:
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Test check-valve on Fuel Pump (FP).
If pressure drops again:
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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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Wait until pressure has dropped, and then switch off ignition. Simultaneously clamp return line (with blue marking) completely closed.
If pressure does not drop now:
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Replace fuel pressure regulator
If pressure drops again:
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Check wire connections, O-rings at fuel distributor and fuel injectors for proper seal.
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Check whether pressure gauge is properly sealed.
NOTE: Before disconnecting pressure gauge, release pressure by opening shut-off valve. Hold a container in front of connection for this.