S4 V8-4.2L (BHF) (2004)
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Attach adapter V.A.G. 1318/17 1 on return line.
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Use hose clamp 3094 to clamp adapter V.A.G. 1318/17 1.
NOTE: The hose clamp 3094 may not set directly on the fuel line - danger of damage.
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Start engine and run at idling speed.
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Switch ignition off once pressure has built up. At the same time, close cut-off valve of pressure gauge V.A.G 1318 (lever at right angle to direction
of flow).
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Observe pressure drop on gauge.
Pressure drops again:
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If valve is defective, replace fuel pump (check valve defective).
The pressure does not drop:
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Replace fuel filter
The pressure drops again:
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Check pressure gauge for tightness.
NOTE:
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Before removing the pressure gauge, lower fuel pressure by opening the shut-off valve. Hold container at the connection.
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The assembly of the fuel system is in reverse order of removal.
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Secure fuel hose to connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and tighten union