Jetta GLS L4-1.8L Turbo (AWP) (2002)
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Open VAG1318 pressure tester shut-off tap (handle in through-flow direction).
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Start the engine and run at idling speed.
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Switch ignition off after the pressure has built-up. At the same time pinch/seal the return hose together.
If the pressure does not drop:
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Replace fuel pressure regulator
If the pressure drops again:
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Check pipe connections, O rings on fuel manifold and injectors for leaks.
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Check pressure gauge for leaks.
NOTE: Before removing the pressure gauge, remove fuse 28 and place a cloth around the connections to be loosened.