Passat Sedan V6-2771cc 2.8L DOHC (AHA) (1998)
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Open shut-off valve on pressure tester (arrow).
The lever is parallel to direction of flow.
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Start engine and run at idle.
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Switch ignition off after pressure build-up.
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At same time pinch/seal return hose -3- together.
If the pressure does not drop:
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Replace fuel pressure regulator, item 5.
If the pressure drops again:
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Check pipe 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.