TT L4-1.8L Turbo (BEA) (2004)
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Connect VAG1318 using adapters 1318/7 and 1318/17 (2 pieces) at supply line.
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Open shut-off valve of pressure gauge. The lever points in the direction of flow.
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Start engine and let run at idle.
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Measure fuel pressure.
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Specification: about 2.5 bar positive pressure
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Disconnect vacuum hose at fuel pressure regulator (arrow).
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Fuel pressure must rise to about 3.0 bar positive pressure.
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Switch ignition off.
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Check for proper seal and residual pressure by observing pressure drop on pressure gauge.
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After 10 minutes, there must be at least 1.5 bar positive pressure
If residual pressure drops below 1.5 bar positive pressure:
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Start engine and let run at idle.
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Wait until pressure has built up, and then switch off ignition. Immediately close shut-off valve of VAG1318 pressure gauge (lever perpendicular to
direction of flow -arrow-).
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Observe pressure drop on pressure gauge.
If pressure does not drop now:
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Test check-valve on transfer Fuel Pump (FP).
If pressure drops again:
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Open shut-off valve of VAG1318 pressure gauge (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 built up, and then switch off ignition. Then immediately clamp return line (with blue marking) completely closed.