Initial Inspection and Diagnostic Overview

Checking EVAP Vapor Lines
1. Visually inspect the EVAP vapor lines for improper attachment, cracks, damage, loose connections, chafing, or deterioration.
2. Inspect the vacuum relief valve of the fuel tank filler cap for clogging and sticking. Refer to EC-37, "How to Detect Fuel Vapor Leakage". Evaporative Emissions Systems