Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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: Perform this procedure to determine that no EVAP diagnostic trouble code (DTC) is present.
3: This test is to locate fuel leakage in the fuel lines.
4: This tests for fuel leaks below the fuel tank fuel level.
5: This test is to locate 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	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. 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. With a scan tool, command the fuel pump ON. Inspect for fuel leaking from the fuel pipes. Did fuel leak from the fuel pipes?	Go to Step 7	Go to Step 4
4	Turn OFF the ignition. Install the J 41413-200 Evaporative Emissions System Tester (EEST) and the J 41415-40 Fuel Tank Cap Adapter. Test for a leak referring to the J 41413 Operator Manual. IMPORTANT: If the floating indicator registers any flow after stabilizing, a leak is evident. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Inspect for a fuel leak while the system is under pressure. Did fuel leak from the fuel tank?	Go to Step 6	Go to Step 5
5	Using the J 41413-200 and the J 41413-210 Operator Manual, introduce smoke into the evaporative emission (EVAP) system. IMPORTANT: It may be necessary to partially lower the fuel tank. Refer to Fuel Tank Replacement (Prior to VIN 4S558922 (100mm Sender)) or Fuel Tank Replacement (VIN 4S558922 and Later (130mm Sender)) . Inspect for leaks in any of the following locations: The fuel tank, fill limiter vent valve, pressure relief valve, and rollover valves-Refer to Fuel Tank Replacement (Prior to VIN 4S558922 (100mm Sender)) or Fuel Tank Replacement (VIN 4S558922 and Later (130mm Sender)) . The fuel sender housing and fuel sender seal-Refer to Fuel Sender Assembly Replacement (Prior to VIN 4S558922 (100mm Sender)) or Fuel Sender Assembly Replacement (VIN 4S558922 and Later (130mm Sender)) . The fuel tank pressure (FTP) sensor seal-Refer to Fuel Tank Pressure Sensor Replacement . The EVAP vapor pipes 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 (Prior to VIN 4S558922 (100mm Sender)) or Fuel Tank Replacement (VIN 4S558922 and Later (130mm Sender)) . Did you complete the repair?	System OK	-
7	Replace the leaking fuel pipe. Refer to Fuel Hose/Pipes Replacement - Filter to Engine and Fuel Hoses/Pipes Replacement - Filter to Tank . Did you complete the replacement?	System OK	-
8	Operate the system under the condition of the customer concern in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2