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Home >> Audi >> 2001 >> S4 Quattro, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System >> Fuel Pressure Test >> Fuel System Residual Pressure
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Fuel System Residual Pressure

  1. Connect Pressure Gauge (VAG 1318) between fuel supply and fuel return lines in engine compartment. See Figure . Start engine and let it idle. Turn engine off.
  2. After 10 minutes observe fuel pressure gauge. If residual fuel pressure is as specified, residual fuel pressure is okay. See appropriate FUEL PRESSURE SPECIFICATIONS table, go to FUEL SYSTEM PRESSURE  . If residual fuel pressure is less than minimum, check fuel lines for leaks and repair as necessary. Check fuel pressure regulator for leaks. Check fuel injectors for leaks. See FUEL INJECTOR TEST  .
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