A8L Quattro Sedan W12-6.0L (BSB) (2005)
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Close off return line - 1 - with hose clamp (3094).
‹› The hose clamp (3094) must not come in contact with the fuel line connection or it may be damaged.
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Start engine and let it run at idle.
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Wait until pressure has risen and switch off ignition. Simultaneously close shut-off valve of pressure gauge (V.A.G 1318) (lever at right angle to
direction of flow) - arrow -.
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Observe pressure drop on gauge.
If the pressure drops again:
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Replace Fuel Pump (FP). Return valve in FP is not sealing.
If the pressure now does not drop:
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Replace fuel filter with integrated fuel pressure regulator.
Assembly is in reverse order of disassembly, noting the following:
‹› Before removing the pressure gauge release the pressure by opening the shut-off valve. Also, use a container to catch any fuel that exits.