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The part on a 2004 Ford F-150 called the evap canister, also known as the purge valve, can be found on the driver side firewall to the left of the brake booster and master cylinder. This component is filled with activated charcoal to capture the emissions produced by your vehicle, making it more eco-friendly and healthier for you as a driver. If the canister malfunctions, you may detect a fuel odor or a rotten egg smell inside the car. Breathing in these fumes is harmful and could cause the car to fail an emissions test, leading to a possible ticket. If you encounter these signs or receive an error code, it's essential to bring your car to a repair shop for inspection and repair.
The evaporation purge valve can be found on the driver's side firewall, positioned to the left of the brake booster and master cylinder.
In my 2004 F-150 with a 4.2-liter engine, the valve you're referring to is the evap vapor management valve, not the purge valve. The evap vapor management valve is located on the metal support bar above the spare tire at the back under the truck bed, while the purge valve is attached to the evap canister.