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 on a hoist. Refer to Vehicle Lifting Caution in Cautions and Notices.
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:

•	Fuel tank leak -- Refer to Fuel Tank Replacement .

•	Fuel sender O-ring or fuel sender leak -- Refer to Fuel Sender Assembly Replacement .

•	Fuel or EVAP pipe leak -- Refer to Fuel Hose/Pipes Replacement - Chassis .