TT Quattro Coupe L4-1.8L Turbo (AWP) (2001)
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Disconnect vacuum hose from fuel pressure regulator.
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The fuel pressure should rise to approx. 3.0 bar.
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Switch off ignition.
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Check leak-tightness and holding pressure by watching the drop in pressure on the pressure gauge.
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After 10 minutes there should still be a pressure of at least 1.5 bar.
If the holding pressure drops below 1.5 bar:
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Start the engine and run at idling speed.
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Allow pressure to build up, then switch off ignition and at the same time close cut-off valve on pressure gauge VAG 1318 (valve handle at right
angles to direction of flow -arrow-).
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Observe pressure drop on gauge.
If the pressure does not drop:
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Check fuel pump non-return valve.
If the pressure drops again:
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Open cut-off valve on pressure gauge VAG 1318 (valve handle points in direction of flow).
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Start the engine and run at idling speed.
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Allow the pressure to build up, then switch off the ignition. At the same time pinch the return hose (with blue marking) firmly 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, release the fuel pressure by opening the cut-off valve.When doing this, hold a container over the
connection.