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Fuel Pressure: Aerio

  1. Release fuel pressure. See RELIEVING FUEL PRESSURE  . Using appropriate "T" connector and adapters, install fuel pressure gauge to fuel inlet at intake manifold. Check fuel pressure as ignition switch is cycled on and off. If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm2 ), go to next step. If fuel pressure is not as specified, go to step  5 .
  2. If fuel pressure maintains 28.4 psi (2.0 kg/cm2 ) or greater for one minute after fuel pump stops, go to next step. If fuel pressure is not as specified, go to step  4 .
  3. Start engine and allow it to reach normal operating temperature. If fuel pressure is 31.3-36.9 psi (2.2-2.6 kg/cm2 ) with engine at idle, fuel pressure is okay. If fuel pressure is not as specified, check for clogged vacuum passage to fuel pressure regulator or faulty fuel pressure regulator. If problem is found, repair as necessary.
  4. Check for fuel leaks from fuel feed hose, pipe or connections. If problem is found, repair as necessary. If no leaks are present, go to step  10 .
  5. If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm2 ) or more, go to next step. If fuel pressure is not as specified, go to step  7 .
  6. Disconnect fuel return hose from fuel pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Turn ignition on. If fuel pressure is 38.4-44.0 psi (2.7-3.1 kg/cm2 ), repair restriction in fuel return hose. If fuel pressure is not as specified, replace fuel pressure regulator and retest system.
  7. If no fuel pressure is present, go to next step. If fuel pressure is present and is less than 38.4-44.0 psi (2.7-3.1 kg/cm2 ), go to step  9 .
  8. Using appropriate clamping pliers, pinch fuel return hose. Observe fuel pressure gauge as ignition switch is cycled on and off. If fuel pressure increases, replace fuel pressure regulator. If fuel pressure is not as specified, ensure there is an adequate supply of fuel in fuel tank. If fuel supply is adequate, check fuel pump and fuel pump circuits. See FUEL PUMP CIRCUIT CHECK  . If problem is found, repair as necessary. After repair, retest system.
  9. Using appropriate clamping pliers, pinch fuel return hose. Observe fuel pressure gauge as ignition switch is cycled on and off. If fuel pressure is 63.9 psi (4.5 kg/cm2 ) or more, replace fuel pressure regulator. If fuel pressure is not as specified, check for clogged fuel filter, restricted fuel feed hose, faulty fuel pump or fuel leakage at hose connection in fuel tank. If problem is found, repair as necessary. After repair, retest system.
  10. Disconnect fuel return hose from pressure regulator. Connect a separate hose to pressure regulator and insert hose end into a container. Recheck fuel pressure. If fuel is discharged into container, replace fuel pressure regulator. If fuel does not discharge into container, check for leaking injector or fuel rail, faulty fuel pump check valve or leaking fuel pressure regulator diaphragm. If problem is found, repair as necessary. After repair, retest system.
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