Locate Ford Expedition Evap System Vent Control Circuit & Ford Expedition Evap Line. Order Ford Expedition Evap. Purchase Ford Expedition Evap System Components. Maintaining the Evap (Evaporative Emission Control System) in your Ford Expedition is crucial for preventing fuel vapors from escaping into the atmosphere, thus keeping your ride environmentally friendly and efficient. Regularly checking for cracks or loose connections in the hoses and replacing the gas cap if it shows signs of wear are simple yet effective ways to ensure longevity. When it's time for a replacement, opt for OEM-grade components that promise compatibility and durability, ensuring your Expedition stays roadworthy. Proper installation is key, so always adhere to manufacturer guidelines to avoid compromising system integrity. Keep your Ford Expedition's emissions in check with top-tier Evap parts to maximize performance and fuel economy.