Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
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Switch OFF ignition.
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Check for leakage and residual pressure by observing pressure drop on gauge.
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After 10 minutes residual pressure must be 2.0 bar minimum
If the holding pressure drops below 2 bar:
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Start engine and let idle.
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Switch OFF ignition after pressure has built-up, at same time close pressure tap
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VAG 1318 handle perpendicular to direction of flow -arrow-
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Observe pressure drop on gauge.
If pressure does not drop:
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Check fuel pump check valve.
If pressure drops again:
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Open pressure tester VAG 1318 shut-off tap.
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VAG 1318 handle in direction of flow
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Start engine and let idle.
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Switch OFF ignition after pressure has built-up, at same time pinch/seal return hose.
If pressure does not drop:
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Replace fuel pressure regulator
If pressure drops again:
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Check line connections, O-rings on fuel manifold and fuel injectors for leakage.
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Check pressure gauge for leaks.
WARNING! Fuel system is under pressure! Before opening the system place a cloth around the connection. Then release pressure by carefully
loosening the connection.