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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1851 (Engine Controls And Fuel - 3.5L (L66) - Troubleshooting & Diagnosis) >> Fuel Tank Leak Test >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  Perform this procedure in order to determine that no EVAP diagnostic trouble code (DTC) is present.
  2. 3:  This test locates fuel leakage in the fuel pipes.
  3. 4:  This tests for fuel leaks below the fuel tank fuel level.
  4. 5:  This test locates fuel vapors escaping above the fuel level in the fuel tank.
Fuel Tank Leak Test

Step Action Yes No
1  Did you perform the Diagnostic System Check-Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
    CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Inspect the fuel tank and the fuel pipes for damage or external leaks.
Did you find fuel leaking from the fuel tank?		 Go to Step 6  Go to Step 3 
3 
  1. Turn ON the ignition, with the engine OFF.
  2. Command the fuel pump relay ON with a scan tool.
  3. Inspect for fuel leaking from the fuel pipes.
Did you find fuel leaking from the fuel pipes?		 Go to Step 7  Go to Step 4 
4 
IMPORTANT: Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. System flow will be less with higher temperatures.
  1. Turn OFF the ignition.
  2. Connect the J 41413-200  Evaporative Emissions System Tester (EEST) power supply clips to a known good 12-volt source.
    3. IMPORTANT: The GE-41415-50  fuel cap adapter, may not be available for the start of production. Once the J41415-50 is available, start the diagnosis at the fuel fill cap.
  3. Install the nitrogen/smoke supply hose onto one of the following sources:
    • Connect the GE-41415-50  to the fuel fill pipe, and the J 41413-200  nitrogen/smoke supply hose to the fuel cap adapter.
    • Connect the J 41413-200  nitrogen/smoke supply hose to the EVAP service port.
    • Turn the nitrogen/smoke valve on the J 41413-200  control panel to NITROGEN.
  4. Turn ON the ignition with the engine OFF.
  5. Command the EVAP vent valve closed with a scan tool.
    6. IMPORTANT: DO NOT exceed 15 inches H2O.
  6. Use the remote switch to introduce nitrogen into the fuel tank.
Did fuel leak from the fuel tank?		 Go to Step 6  Go to Step 5 
5 
IMPORTANT: Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. System flow will be less with higher temperatures.
  1. Turn OFF the ignition.
  2. Connect the J 41413-200  Evaporative Emissions System Tester (EEST) power supply clips to a known good 12-volt source.
    3. IMPORTANT: The GE-41415-50  fuel cap adapter, may not be available for the start of production. Once the J41415-50 is available, start the diagnosis at the fuel fill cap.
  3. Install the nitrogen/smoke supply hose onto one of the following sources:
    • Connect the GE-41415-50  to the fuel fill pipe, and the J 41413-200  nitrogen/smoke supply hose to the fuel cap adapter.
    • Connect the J 41413-200  nitrogen/smoke supply hose to the EVAP service port.
  4. Turn ON the ignition with the engine OFF.
  5. Command the EVAP vent valve closed with a scan tool.
  6. Turn the nitrogen/smoke valve on the J 41413-200  control panel to SMOKE.
  7. Use the remote switch to introduce smoke into the fuel system for 60 seconds.
  8. Inspect the entire EVAP/fuel system for exiting smoke with the J 41413-SPT  High Intensity White Light. See Special Tools .
  9. Continue to introduce smoke at 15 second intervals until the leak source has been located.
Did you locate and repair a leak source?		 Go to Step 8  Go to Diagnostic Aids In This Test
6 Replace the fuel tank. Refer to Fuel Tank Replacement .
Did you complete the replacement?		 Go to Step 8  -
7 Replace the leaking fuel pipe. Refer to Fuel Hose/Pipes Replacement - Chassis .
Did you complete the replacement?		 Go to Step 8  -
8 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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