Important: Before attempting the Fuel Tank Leak Check place a dry chemical (Class B) fire extinguisher near the work area.

1. Install the J 41415-40 fill tank cap adaptor.
2. Connect the J 41413 EVAP pressure/purge diagnostic station to the fill tank cap adaptor.
3. With a scan tool, seal the EVAP system.
4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
5. With the EVAP diagnostic station, maintain 15 in. H2O (3.75 kPa) within the fuel tank.

Important: It may be necessary to partially lower the fuel tank to inspect the top of the fuel tank and fuel sender assembly O-ring. Refer to Fuel Tank Replacement .

6. With the J 41416 ultrasonic leak detector, test for leaks in the fuel tank and EVAP pipes.
7. Visually inspect for fuel leaking from the fuel tank.
8. If a leak is detected refer to the following component replacements:

•	For a fuel tank leak, refer to Fuel Tank Replacement .

•	For a fuel sender O-ring or fuel sender leak, refer to Fuel Sender Assembly Replacement .

•	For a fuel or EVAP pipe leak, refer to Fuel Hoses/Pipes Replacement - Filter to Tank .