New Beetle GLS L4-1.8L Turbo (AWV) (2001)
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Wait until pressure has risen, and then switch off ignition. Simultaneously close shut-off valve of pressure gauge (lever perpendicular to direction
of flow -arrow-).
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Observe pressure drop on pressure gauge.
If pressure does not drop:
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Test check-valve of Fuel Pump (FP), Fuel Pump (FP), checking.
If pressure does drop again:
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Open shut-off valve of pressure gauge (VAG1318) (lever in direction of flow).
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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 pinch return hose tightly together.
If pressure does not drop:
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Replace fuel pressure regulator, item 12
If pressure does drop again:
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Check whether line connections, O-rings in fuel rail, and fuel injectors are properly sealed.
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Check whether pressure gauge is properly sealed.
NOTE: Before removing pressure gauge, remove fuse 28 again and put cleaning rags back around line connection which is to be disconnected.