GTI V6-2792cc 2.8L DOHC (AAA) (1996)
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Disconnect vacuum hose from intake manifold upper section at fuel pressure regulator (arrow).
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The fuel pressure must rise to approx. 3.0 bar (44 psi).
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Switch ignition off.
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Check for leaks and residual pressure by watching pressure drop on gauge.
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After 10 minutes there must be a residual pressure of at least 2 bar (29 psi).
If the residual pressure drops below 2 bar (29 psi):
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Start engine and run at idle speed.
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After the pressure has built up switch ignition off and at the same time clamp-off return line (with blue arrow) on fuel rail.
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Watch pressure drop on gauge.
If the pressure does not drop:
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Replace fuel pressure regulator.
If the pressure drops again:
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Check fuel pump check valve.
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Check hose connections, O-rings on fuel rail and fuel injectors for leaks.
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Check pressure gauge for leaks.