Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2005 Chevrolet Aveo L4-1.6L VIN 6FACTORY OEM SERVICE PROCEDURE
Fuel Tank Leak Test
FUEL TANK LEAK TEST
DESCRIPTION
The fuel tank leak test is used to locate any fuel or fuel vapor escaping the fuel tank area. Fuel vapors escaping above the fuel level will be detected when the evaporative emissions (EVAP) leak diagnostic completes one test cycle.
DIAGNOSTIC AIDS
- Operate the vehicle under the condition of the customers concern. Under high temperature conditions fuel vapors may increase to the point of EVAP canister vapor saturation. Fuel vapors would then be released into the atmosphere. Once the engine is running and EVAP purge is enabled, all fuel vapor release would be eliminated.
- Movement of the EVAP pipes or fuel pipes may help find an intermittent condition.
TEST DESCRIPTION
3. This step tests for location of fuel leakage in the fuel lines.
4. This step tests for fuel leaks below the fuel level in the fuel tank.
5. This step tests for a location of fuel vapors escaping above the fuel level in the fuel tank.
DESCRIPTION
The fuel tank leak test is used to locate any fuel or fuel vapor escaping the fuel tank area. Fuel vapors escaping above the fuel level will be detected when the evaporative emissions (EVAP) leak diagnostic completes one test cycle.
DIAGNOSTIC AIDS
- Operate the vehicle under the condition of the customers concern. Under high temperature conditions fuel vapors may increase to the point of EVAP canister vapor saturation. Fuel vapors would then be released into the atmosphere. Once the engine is running and EVAP purge is enabled, all fuel vapor release would be eliminated.
- Movement of the EVAP pipes or fuel pipes may help find an intermittent condition.
TEST DESCRIPTION
Steps 1-4:
Steps 5-8:
3. This step tests for location of fuel leakage in the fuel lines.
4. This step tests for fuel leaks below the fuel level in the fuel tank.
5. This step tests for a location of fuel vapors escaping above the fuel level in the fuel tank.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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