Description: Without diesel, 5.0, 5.7 & 7.4L. Express, savana. Cargo, passenger van. Astro, Safari. 4.3l. At frame rail. All models. 4.3l. With 7.4L, gas. Without diesel, 4.3L. Exc.Auxiliary Fuel Tank. Helps reduce harmful pollutants from entering the atmosphere Captures fuel vapors to be re-burned in the engine This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors