Jetta Wagon L4-1.8L Turbo (AWP) (2005)
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Pull off supply line/hose -1- and collect leaking fuel with a cloth.
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Connect V.A.G1318 pressure gauge to fuel supply line/hose and to hose to fuel rail using adapters 1318/9 and 1318/17.
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Open shut-off tap on pressure gauge. Handle points in direction of flow.
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Reinstall fuse 28 (fuel pump) in fuse holder.
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Start engine and run at idling speed.
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Measure fuel pressure.
Specification: Approx. 2.5 bar
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Pull vacuum hose -1- off fuel pressure regulator -2-.
Specification: Fuel pressure must increase to approx. 3.0 bar.
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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Switch ignition off.
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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 engine and run at idling speed.