TT Quattro Roadster L4-1.8L Turbo (AMU) (2002)
Fuel Pressure: Testing and Inspection
System Pressure, Fuel Pressure Regulator And Residual Pressure, Checking
Special tools and equipment
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VAG1318
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VAG1318/7
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VAG1318/17 (2x)
NOTE: Fuel pressure regulator regulates fuel pressure according to intake manifold pressure. This ensures that the pressure drop at the fuel injectors
remains the same for each speed and load range of the engine.
Test requirements:
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Fuel Pump (FP) OK, checking. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and
General Diagnostics/Fuel Pump (Fp) Relay -J17-, Testing and Activating
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Fuel Pump (FP) OK, checking:
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Fuel filter OK
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Battery voltage at least 11 V
WARNING: Fuel system is under pressure! Place a cloth around connection point before opening system. Then release pressure by carefully
loosening connection point.
Checking system pressure
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Open fuel filler flap briefly (pressure release).