Touareg V8-4.2L (BHX) (2004)
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Loosen spring-type clamp and remove fuel hose from connection at fuel rail. --> [ (Item 14) Spring-type clip ]
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Connect pressure gauge (V.A.G 1318) with adapters (V.A.G 1318/7), (V.A.G 1318/10), (V.A.G 1318/13) as shown in illustration.
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The lever or pressure gauge (V.A.G 1318) - 1 - points in direction of flow.
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Secure both hose ends - 2 - with clamps.
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Start engine and run at idle speed.
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Measure fuel pressure. Specified value: approx. 4.0 bar positive pressure
If specification is not obtained:
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Check delivery rate of fuel pumps --> [ Fuel Pumps, Checking Delivery Quantity ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel Pumps, Checking Delivery Quantity.
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If necessary, replace fuel pressure regulator - 2 -.