Golf GL L4-2.0L (AEG) (2001)
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Disconnect vacuum line -1- from harness connector -2-. The fuel pressure must increase to approx. 3.0 bar.
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Turn off ignition.
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Check for leaks and holding pressure by observing pressure drop on gauge. After 10 minutes there must be a residual pressure of at least 2.0 bar.
If the holding pressure drops below 2 bar:
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Start engine and run at idle speed.
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Turn off ignition after pressure has built-up. At the same time, close pressure gauge cut-off valve (handle perpendicular to direction of flow
(arrow)).
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Observe pressure drop on gauge.
If the pressure drops again:
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Check fuel pump non-return valve.
If the pressure does not drop: