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Injector Leak Test (3.0L)

  1. Relieve fuel system pressure. See FUEL SYSTEM PRESSURE RELIEF (SATURN) under BASIC FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES - CARS - EXCEPT PRIZM.
  2. Connect Fuel Flow/Pressure Adapter (SA9127E-7) to fuel pressure test port.
    3. NOTE: Lay shop towels on intake manifold and cam cover to collect any fuel. Make sure the injectors are positioned to prevent fuel from being sprayed onto the engine. Make sure that the injector retaining clips are properly installed.
  3. Remove fuel rail assembly. Pull fuel rail back far enough so that nozzles of injectors are visible but still in ports. Attach fuel rail to intake manifold with wire.
  4. Connect Gauge Bar Set (SA9127E) to pressure adapter.
  5. Wipe tips of fuel injectors free of any fuel or debris. Place a clean White towel directly under fuel injectors. Ensure towel lightly contacts each fuel injector tip.
  6. Connect scan tool and turn ignition On. Battery must be at a minimum of 12 volts when performing any fuel system test. Charge battery before proceeding if below 12 volts.
  7. Using scan tool, energize fuel pump.
  8. Observe fuel injector tips for leakage of fuel. If one or more of the White towels becomes wet with fuel after five minutes, replace faulty fuel injector. Pressure gauge reading should be approximately 40-50 psi (276-345 kPa).
  9. Test assembly a minimum of two times.
  10. Install bleed hose from fuel flow/pressure adapter into an approved container.
  11. Open valve to bleed system pressure.
  12. Remove fuel pressure adapter from fuel pressure test port.
  13. Install fuel pressure test port cap. Replace plastic fuel line retainers whenever fuel supply lines are disconnected at fuel filter and fuel rail. Install new retainer into female portion of connection. Care must be taken to assure that locking tab is centered in window of female connection. Firmly press male and female portions together until a "click" is heard, then pull firmly back to confirm engagement.
  14. Lubricate injector "O" rings with clean engine oil and install fuel rail assembly.
  15. Start engine and check for leaks.
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