Golf GLS L4-2.0L (AEG) (2001)
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Open VAG1318 pressure gauge shut-off tap (handle perpendicular to direction of flow).
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Start engine and run at idle speed.
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Turn off ignition after pressure has built-up. At same time, pinch/seal return line together.
If the pressure does not drop:
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Replace fuel pressure regulator.
If the pressure drops again:
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Check line connections, O-rings on fuel rail and fuel injectors for leaks.
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Check pressure gauge for leaks.
NOTE: Before removing pressure gauge, place a cloth around the connections to be loosened.