Q: What is the Evaporative Emissions Control (EVAP) System,Canister Purge Valve and Vapor Canister on Dodge Ram 2500 and Ram 2500?
A: The EVAP system prevents fuel system vapors from escaping into the atmosphere. On warm days, vapors are routed from the fuel tank to the EVAP canister, where they're stored temporarily. The EVAP canister, containing activated charcoal, is located underneath the vehicle.