7 - Fuel Injector Tip Leakage Test

CAUTION: Do not allow smoking or the use of open flames in the area where work on the fuel system is taking place. Anytime the fuel system is being worked on, disconnect the negative battery cable, except for those tests where battery voltage is required.




1. Relieve fuel system pressure. (Refer to "Relieving Fuel Pressure" procedure.) Service and Repair

CAUTION: Whenever fuel line fittings are loosened or disconnected, wrap a shop cloth around fitting while connecting gauge, to collect fuel. Place the cloth in an approved container.

2. Connect pressure gauge adapter (309725) to fuel pressure test port.

CAUTION:
^ 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. (Refer to "Fuel Rail Removal" procedure.) Service and Repair
a. Pull fuel rail back far enough so that nozzles of injectors are visible but still in ports.
b. Attach fuel rail to intake manifold with wire.




4. Connect fuel pressure gauge bar to fuel pressure test port.
5. Wipe tips of fuel injectors free of any fuel or debris.
a. Place a clean white towel directly under fuel injectors.
b. Ensure towel lightly contacts each fuel injector tip.
6. Connect Scan tool and turn ignition On.

IMPORTANT: Battery must be at a minimum of 12 volts when performing any fuel system test. Charge battery before proceeding if below 12 volts.

7. Energize fuel pump. (Refer to "Energizing Fuel Pump" procedure.) Component Tests and General Diagnostics
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. (Refer to "Fuel Injector Removal" procedure.) SEE Fuel Injector, Service and Repair

IMPORTANT: Pressure gage reading should be approximately 276-345 kPa (40-50 psi).

9. Test assembly a minimum of two times.
10. Install bleed hose from pressure test adapter (309725) 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.
14. Lubricate injector O-rings with clean engine oil and install fuel rail assembly. (Refer to "Fuel Rail Assembly Installation" procedure.)
15. Start engine and check for leaks.