A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
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Start engine and let run at idle.
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Wait until pressure has risen, and then switch off ignition. Simultaneously close shut-off valve of V.A.G1318 pressure gauge (lever perpendicular
to direction of flow -arrow-).
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Observe pressure drop on pressure gauge.
If pressure drops again, check-valve of fuel pump is leaky.
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Replace fuel pump.
If pressure does not drop now:
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Replace fuel filter with integrated fuel pressure regulator.
Assembly is performed in the reverse order of removal, noting the following:
Note: Before disconnecting pressure gauge, release fuel pressure by opening shut-off valve. Hold a container in front of connection for this.
Checking fuel pressure regulator - Vehicles with All Wheel Drive (AWD):
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Remove rear seat bench.
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Remove cover for left connector flange (arrows).
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Disconnect fuel return line (arrow) from connector flange (left side of vehicle).