Touareg V8-4.2L (BAR) (2007)
If no malfunction can be found:
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Replace sensor flange with pressure relief valve --> [ (Item 15) Flange ] See: Fuel Tank/Service and Repair/Removal and Replacement/Fuel Tank
and Attachments Assembly Overview.
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Repeat the test.
If fuel pressure is not obtained again:
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FP faulty, replace fuel delivery unit. Refer to --> [ Fuel Delivery Unit and Fuel Level Sensor ] See: Service and Repair/Fuel Delivery Unit and
Fuel Level Sensor.
Residual Pressure, Checking
Test Conditions
‹› The pressure gauge (VAG 1318) remains connected. Refer to --> [ Fuel Pressure, Checking ].
‹› Fuel pressure of approximately 5.6 bar is displayed on pressure tester (VAG 1318), checking. Refer to --> [ Fuel Pressure, Checking ].
‹› Remote control (VAG 1348/3A) is connected.
Test Sequence
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Watch pressure drop on gauge. After 10 minutes the pressure must not drop below a 4.0 bar decrease.
If the pressure drops below 4.0 bar:
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Operate the remote control (VAG 1348/3A) and observe display of pressure tester (VAG 1318) while doing this.
Fuel pressure must increase up to a maximum pressure of 6 bar.
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Release control button for the remote control (VAG 1348/3A) and immediately close the shut off valve on the pressure tester. Lever then points
perpendicular to flow direction - arrow -.
‹› When releasing control button for the remote control (VAG 1348/3A), fuel pressure decreases to approximately 5.6 bar.
If the Pressure Drops Below 4.0 Bar Again
(Leak on fuel tank side)
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Check connections to fuel tank for leaks.
If no malfunction can be found:
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Check fuel filter for leaks.