Touareg 2 V6-3.6L (BHK) (2008)
If the Pressure Drops Again
(Leak on fuel tank side)
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Check fuel filter for leaks.
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Check fuel line to sensor flange --> [ (Item 15) Flange ] See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Tank/Service and
Repair/Removal and Replacement/Fuel Tank and Components Assembly Overview for leaks.
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Check all additional fuel lines in fuel tank for leaks.
If no malfunctions are found on fuel line:
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Pressure relief valve in fuel delivery unit flange faulty.
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Replace sensor flange with pressure relief valve --> [ (Item 15) Flange ] See: Powertrain Management/Fuel Delivery and Air Induction/Fuel
Tank/Service and Repair/Removal and Replacement/Fuel Tank and Components Assembly Overview.
If the Pressure Does Not Decrease Any More
(Leak on engine side)
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Check the connections at the fuel rails and the high pressure pump for leaks.
If no malfunction can be found:
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Replace high pressure pump.
Delivery Quantity, Checking
Test Sequence
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Read safety precautions before beginning work. Refer to --> [ Safety Precautions ] See: Powertrain Management/Fuel Delivery and Air
Induction/Service Precautions/Vehicle Damage Warnings/Safety Precautions.
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Observe the rules for cleanliness. Refer to --> [ Clean Working Conditions ] See: Powertrain Management/Fuel Delivery and Air
Induction/Service Precautions/Vehicle Damage Warnings/Clean Working Conditions.
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Remove the rear bench seat.
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Remove the fuel delivery unit cover nut - 1 - on the right side. It may be necessary to remove the backrest bearing - 2 - or the mounting bracket.