New Beetle L4-1.8L Turbo (BNU) (2005)
If the specification is obtained:
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Check for leaks and residual pressure by observing pressure drop on gauge.
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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 idling speed.
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Switch ignition off after pressure has built-up. At same time close shut-off tap of pressure gauge V.A.G 1318 (lever diagonal to direction of flow -
arrow -).
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Observe pressure drop on gauge.
If the pressure does not drop:
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Check fuel pump non-return valve.
If the pressure drops again:
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Open shut-off tap of pressure gauge V.A.G 1318 (lever in direction of flow).
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Start engine and run at idling speed.
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Switch ignition off after pressure has built-up. At same time pinch/seal return hose closed.
If the pressure does not drop:
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Replace fuel pressure regulator
If the pressure drops again:
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Check line connections, O-rings on fuel rail and injectors for leaks.
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Check pressure gauge for leaks.
NOTE: Before removing pressure tester, remove fuse 28 again and place a cloth around the connections to be loosened.