Test 8 - Fuel Injector(S) Tip Leakage Test

CAUTION:
^ DO NO NOT ALLOW SMOKING OR THE USE OF OPEN FLAMES IN THE AREA WHERE WORK ON THE FUEL SYSTEM IS TAKING PLACE. ANYTIME WORK IS BEING DONE ON THE FUEL SYSTEM, DISCONNECT THE NEGATIVE BATTERY CABLE, EXCEPT FOR THOSE TESTS WHERE BATTERY VOLTAGE IS REQUIRED.
^ WHENEVER FUEL LINE FITTINGS ARE LOOSENED OR REMOVED, WRAP A SHOP CLOTH AROUND THE FITTING AND HAVE AN APPROVED CONTAINER AVAILABLE TO COLLECT ANY FUEL.
^ FUEL SUPPLY LINES WILL REMAIN PRESSURIZED FOR LONG PERIODS OF TIME AFTER THE ENGINE IS SHUTDOWN. THIS PRESSURE MUST BE RELIEVED BEFORE SERVICING THE FUEL SYSTEM.

IMPORTANT:
Battery must be at a minimum of 12 volts when performing any fuel system tests.

Description:

TEST 8 - FUEL INJECTOR TIP LEAKAGE TEST

1. Remove air intake tube and resonator.
2. Perform Fuel Pressure Release procedure.
3. Connect pressure gauge adapter (309725) to fuel pressure test port.
4. Remove fuel feed line clip attachment screw (10 mm hex).

CAUTION:
^ LAY SHOP TOWELS ON [1][2]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.

5. Remove fuel rail assembly attachment bolts and pull fuel rail back far enough so that the nozzles of the fuel injectors are visible but still in ports. Attach the fuel rail to the [1][2]intake manifold with safety wire.
6. Connect fuel pressure gauge bar to pressure adapter.


7. Wipe the tips of the fuel injectors free of any fuel or debris and place a clean white towel directly under fuel injector& The clean white towel must lightly contact each fuel injector tip. This will serve as an indicator of leaky fuel injectors by showing spots where fuel has leaked as well as block the injector ports from any debris that might enter.
8. Connect Scan tool, turn ignition On. (Refer to "Energizing Fuel Pump".)
9. Energize fuel pump using Scan tool and observe the fuel injector tips for leakage of fuel. If one or more of the white towels becomes wet with fuel after five minutes, replace the faulty fuel injector. It is very difficult to measure drops of fuel from a injector. Refer to "Fuel Injector / Service and Repair.

IMPORTANT: Pressure gage reading should be approximately 276-379 kPa (40-55 psi).

10. Test assembly a minimum of two times.
11. Install bleed hose from pressure test adapter (3)9725) into an approved container and open valve to bleed system pressure. Once pressure is bled, remove fuel gage adapter from the fuel pressure test port and recap it.
12. Lubricate injector O-rings with clean engine oil and install fuel rail assembly. Refer to "Fuel Rail / Service and Repair."
13. Start engine and check for leaks.