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The 2015 Ford F-150 has a component called the evap switching valve situated in the intake box. The EVAP system in this vehicle consists of various parts linked to managing intake, fuel, and exhaust functions of the engine. Often, systems are equipped with a purge valve that regulates the release of fuel vapors from the fuel tank to the intake manifold by opening and closing at specific intervals. A prevalent issue with the purge valve occurs when it becomes stuck or fails to close completely. When this happens, it can trigger the illumination of the "Check Engine" warning light. A stuck-open purge valve might lead to challenges when starting the engine immediately after refilling at a gas station, causing rough running and stumbling for the initial few seconds. Purge valve complications are widespread among different vehicle models.
The intake has the purge valve, while the fuel tank's top holds the switching valve.
The evap switching valve for the 2015 Ford F150 can be found on the intake box.