Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
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Disconnect vacuum hose from fuel pressure regulator (arrow).
The fuel pressure must increase to approx. 4.0 bar (58.8 psi).
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Switch ignition off.
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Check for leaks and residual pressure by observing pressure drop on gauge.
After 10 minutes there must be a residual pressure of at least 2.0 bar (29.4 psi).
If the residual pressure drops below 2 bar (29.4 psi):
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Start engine and let idle.
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Switch ignition off after pressure has built- up.
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Close shut off valve on VAG1318 pressure tester.
The lever is perpendicular to direction of flow.
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Observe pressure drop on gauge.
If the pressure does not drop:
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Check the check valve in electric fuel pump.
If the pressure drops again: