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Repair guides and support for the eighth generation of Ford F-Series trucks: the F-150, F-250, F-350, and F-Super Duty.

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What is the small filter for in my air filter box

What is the small filter located in the air filter box

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sloatk whgat year and what model is your Ford? engine Size? Add a picture of that filter and its location so we can see what you see. Adding images to an existing question

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It’s a PCV filter used in the positive crankcase ventilation (PCV) system.

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