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Replace Fuel Tank Cap Gasket

Model: BMW Serie 7 E68, E65, MK 4, E67, E66 - Years 2001-2008
Part: Fuel cap

The fuel tank cap is equipped with a gasket that seals the tank, preventing the escape of vapors generated inside the tank due to increased pressure; these vapors are directly introduced into the intake manifold through a valve that detects the pressure increase in the tank. A failure of the cap gasket will result in decreased pressure in the tank, triggering the check engine light on the dashboard; replacing the cap gasket is obviously very simple.

Updated on 19 February 2026 by ScegliAuto

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