GTI L4-2.0L Turbo (CBFA) (2008)
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Check check-valve in fuel delivery unit. To do so, connect pressure gauge V.A.G 1318 with adapter set V.A.G 1318/17 between fuel filter and fuel
supply line.
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Open shut-off valve of pressure gauge. The lever points in the direction of flow.
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Switch ignition on often until fuel pressure on pressure gauge no longer rises.
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Read off fuel pressure on pressure gauge. Specified value: 3.5 to 6.0 bar.
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After pressure has built up, immediately close shut-off valve of pressure measuring device.
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Watch pressure drop on gauge. After 10 minutes the pressure must not drop below a 3.0 bar decrease.
If pressure drops:
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Check-valve in Fuel Pump (FP) faulty, replace fuel delivery unit.
If pressure does not drop:
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Pressure relief valve in fuel filter malfunctioning, replace fuel filter.