Passat V6-2.8L (ATQ) (2004)
If the residual pressure drops below 2 bar:
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Start engine and run at idle speed.
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Wait until pressure has risen, and then switch off ignition. At same time close pressure gauge V.A.G 1318 shut-off valve (lever perpendicular to
flow direction - arrow -).
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Watch pressure drop on gauge.
If the pressure does not drop:
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Test check valve of fuel pump.
If the pressure drops again:
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Open shut-off valve on pressure gauge V.A.G 1318 (lever in flow direction - arrow -).
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Start engine and run at idle speed.
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Wait until pressure has risen, and then switch off ignition. At same time pinch return hose -3- tightly together.
If the pressure does not drop:
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Replace fuel pressure regulator.
If the pressure drops again:
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Check whether line connections, O-rings in fuel distributor, and fuel injectors are properly sealed.
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Check pressure gauge for proper seal.
Assembly is performed in the reverse order of removal. Also observe the following:
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Before removing pressure gauge, remove fuse No. 28 and put cleaning rags back around line connection which is to be disconnected.
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Fasten fuel supply hose to fuel rail