Touareg V8-4.2L (BHX) (2004)
If specified value is achieved:
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Switch off ignition.
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Check for leaks and residual pressure. Observe pressure drop on pressure gauge. After 10 minutes there must be a residual pressure of at least 3.0
bar.
The holding pressure drops below 3 bar:
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Check pressure gauge for leaks.
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Check right and left fuel pump non-return valves --> [ Right Fuel Pump Check Valve, Checking ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Right Fuel Pump Check Valve, Checking and --> [ Left Fuel
Pump Check Valve, Checking ] See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and
General Diagnostics/Left Fuel Pump Check Valve, Checking.
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Switch off ignition.
When removing pressure gauge after completing test:
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Place a rag around threaded connection - arrow - and relieve fuel pressure by briefly opening the line.
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Remove pressure gauge (V.A.G 1318) with adapters.
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Connect fuel hose to fuel rail again and secure it with spring-type clamp --> [ (Item 14) Spring-type clip ]