Fuel Rail Insulator

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Fuel Rail Insulators are small rubber rings installed between the fuel rail and the lower intake manifold. These help create a strong seal between these two parts in order to prevent a vacuum/boost leak. Like Balance Tube O-Rings, they are generally reusable, but should be replaced when they've become too "squished" to create a good seal.

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Please note that these should not be confused with Fuel Rail Grommets, which support the fuel rail at its mounting points.

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