Checking Fuel Pressure Regulator Valve - Touareg 2 V6-36L (BHK) (2008) Maintenance
If no malfunction can be found:
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Replace sensor flange with pressure relief valve.--> Engine Mechanical, Fuel Injection and Ignition 20 Removal and Installation
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Repeat test.
If fuel pressure is not obtained again:
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Fuel Pump (FP) faulty, replace fuel delivery unit.--> Engine Mechanical, Fuel Injection and Ignition 20 Removal and Installation
Residual Pressure, Checking
Test conditions
‹› The Pressure Gauge remains connected --> [ Fuel Pressure, Checking ]
‹› Fuel pressure of approx. 5.6 bar is displayed on pressure tester, checking --> [ Fuel Pressure, Checking ].
‹› Hand held remote starter (jumper) is connected.
Test sequence
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Watch pressure drop on gauge. After 10 minutes pressure must not drop below a 4.0 bar decrease.
If pressure drops below 4.0 bar:
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Operate Hand held remote starter (jumper) while doing this, observe display of pressure tester.
Fuel pressure must increase up to a maximum pressure of 6 bar.
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Release control button of Hand held remote starter (jumper) and immediately close shut-off valve of pressure tester. Then lever the points
perpendicular to flow direction - arrow -.
‹› When releasing control button of Hand held remote starter (jumper), fuel pressure decreases to approx. 5.6 bar.
If 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.
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Check fuel line to sensor flange for leaks.