Ethanol Fuel and Vintage Vehicles - Ethanol Education
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One of these three accelerator pump assemblies is likely found in any Quadrajet carburetor kit presently on parts store shelves. The black cup (left) typically fails when used with ethanol-blend fuel, while the blue units (center and right) are differing grades of fluorelastomer, which are compatible with it. Cliff Ruggles of Cliff's High Performance says that the units constructed of soft-white plastic (left and center) are also prone to ethanol-related failure; the red plastic unit isn't. View Related Article
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