Jetta GLX Wagon V6-2.8L (AFP) (2001)
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Open VAG1318 pressure gauge shutoff tap (handle perpendicular to direction of flow).
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Start engine and run at idle.
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Switch ignition off after pressure has built-up. At same time pinch/seal return line together.
If the pressure does not drop:
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Replace fuel pressure regulator, item -15-. Refer to "Intake Manifold Lower Section, Disassembling and Assembling",
If the pressure drops again:
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Check pipe connections, O-rings on fuel rail and fuel injectors for leaks.
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Check pressure gauge for leaks.
NOTE: Before removing the pressure gauge, place a cloth around the connections to be loosened.