Passat Wagon L4-2.0L Turbo (BPY) (2008)
If no malfunction is found in the return line between the fuel filter and the fuel pump:
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The pressure relief valve in the fuel filter is malfunctioning, replace the fuel filter.
If specified value is not obtained:
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Check the fuel pressure in front of the fuel filter.
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Connect a High pressure fuel gauge between the fuel filter and the fuel supply line.
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Open the shut-off valve of the High pressure fuel gauge.
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Start the engine and let it run at idle.
CAUTION!
Shut-off valve must only be closed slowly. At a fuel pressure of 8 bar, shut-off valve must be opened again immediately to prevent damage
to pressure measuring device.
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Slowly close the shut-off valve of the High pressure fuel gauge. Pressure must increase to min. 6.0 bar. If 6 bar is reached, open shut-off valve
again immediately!
If the fuel pressure increases:
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The pressure relief valve in the fuel filter malfunctioning, replace the fuel filter.
If the fuel pressure does not increase:
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Replace the fuel pump.