Initial Inspection and Diagnostic Overview

1. Verify the customer's concern by removing the fuel tank filler cap to duplicate the condition.
2. Inspect to determine if any of the following mechanical concerns apply:

Mechanical
Hissing sound or release of pressure as the fuel tank filler cap is removed from the fuel tank filler pipe.

3. If the inspection reveals obvious concerns that can be readily identified, service as required.
4. If the concern(s) remain after the inspection, determine the condition and refer to Symptom Chart. Symptom Related Diagnostic Procedures