Beetle L4-1781cc 1.8L Turbo (APH) (1999)
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Pull vacuum hose off fuel pressure regulator -arrow-. The fuel pressure must increase to approx. 3.0 bar.
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Switch off ignition.
If the specification is not obtained:
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Check quantity supplied by fuel pump.
If the specification is obtained:
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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 the engine and run at idle speed.
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Switch ignition off after the pressure has built-up. At the same time close pressure measured device cut-off tap (handle cross through-flow
direction - 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 does not drop:
