Passat Syncro Wagon V6-2.8L (ATQ) (2000)
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Wait until pressure has dropped, and then switch off ignition. Simultaneously close stop valve of pressure gauge VAG 1318 (lever at right angles
to direction of flow (arrow)).
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Observe pressure drop on manometer.
If pressure does not drop:
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Test check-valve on transfer Fuel Pump (FP).
If pressure does drop again:
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Open stop valve of pressure gauge VAG 1318 (lever in direction of flow (arrow)).
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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 pinch return hose (3) tightly together.
If pressure does not drop:
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Replace fuel pressure regulator item 5.
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, put cleaning rags back around line connection which is to be disconnected.