Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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.

4: This step tests for fuel leaks below the fuel tank fuel level.
5: This step 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-Engine Controls?	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	IMPORTANT: Before performing this procedure, place a dry chemical (class B) fire extinguisher near the work area. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Inspect the fuel tank and 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	Turn ON the ignition, with the engine OFF. Command the fuel pump relay ON with a scan tool. 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	Install the J 41415-40 Fuel Tank Cap Adaptor. Connect the J 41413-200 Evaporative Emissions System Tester (EEST) to the fuel tank cap adaptor. Command the EVAP vent solenoid ON with a scan tool. IMPORTANT: Do not exceed 15 in H2O. Pressurize the fuel tank with the J 41413-200 . Did you find fuel leaking from the fuel tank?	Go to Step 6	Go to Step 5
5	Maintain pressure in the fuel tank with the J 41413-200 . IMPORTANT: It may be necessary to partially lower the fuel tank. Refer to Fuel Tank Replacement (Right) or Fuel Tank Replacement (Left) . With the J 41416 Ultrasonic Leak Detector, test for leaks above the fuel level in the following locations: The fuel tank, fill limiter vent valve, pressure relief valve and rollover valves-Refer to Fuel Tank Replacement (Right) or Fuel Tank Replacement (Left) . The fuel sender housing and fuel sender seal-Refer to Fuel Sender Assembly Replacement (RH) or Fuel Sender Assembly Replacement (LH) . The fuel tank pressure (FTP) sensor seal-Refer to Fuel Tank Pressure Sensor Replacement . The EVAP vapor pipes-Refer to Evaporative Emission (EVAP) System Hoses/Pipes Replacement (Vacuum Supply) or Evaporative Emission (EVAP) System Hoses/Pipes Replacement (Engine Purge Pipe) . The fuel fill pipe and hose-Refer to Filler Tube Replacement . Did you find and correct the condition?	Go to Step 8	Go to Diagnostic Aids
6	Replace the fuel tank. Refer to Fuel Tank Replacement (Right) or Fuel Tank Replacement (Left) . Did you complete the replacement?	Go to Step 8	-
7	Replace the leaking fuel pipe. Refer to Fuel Hose/Pipes Assembly Replacement . 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