Abstract: An air intake filter for internal combustion engines designed to prevent the escape of fuel fumes to the atmosphere, the filter cartridge including a rectangular block-shaped filter body folded of filter paper with horizontal top and bottom fold edges, the fold cavities on the downstream side of the cartridge being filled with activated carbon which is retained by a cover layer of fiber fleece. The outer edges of the filter body and of the cover layer are embedded in a resilient sealing collar. The longitudinal extremities of the fold cavities are closed by fold pockets.