A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
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Start engine and run at idle.
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Allow pressure to build up, then switch off ignition. At same time close shut-off valve on pressure gauge V.A.G 1318 (valve lever at right angles
to direction of flow -arrow-).
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Observe pressure drop on gauge.
If the pressure drops again:
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Check pressure gauge for leaks.
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Check line connections, O-rings on fuel rail and injectors for leaks.
If the pressure does not drop:
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Check pressure regulator in fuel filter.
Checking fuel pressure regulator - vehicles with front wheel drive
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Remove trim in luggage compartment.
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If necessary fold right backrest of rear seat bench forward.
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Unscrew cover for sealing flange (arrow).
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Disconnect fuel return line -2- from sealing flange.