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depends if the 350 is fuel injected or carbureted. If carbureted, the likely cause is the carburetor itself, such as a stuck float preventing fuel from getting into the manifold, or bad fuel filter blocking fuel delivery, or fuel pump. If the carb is sucking air, which is simple to check, then the manifold is not blocked, you could however have a bad manifold gasket, or even a warped manifold, which would prevent the necessary vacuum from doing its job. If fuel injected, bad or dirty injectors, or manifold gasket leak, or even fuel pump itself. The Manifold needs Vacuum to operate properly, but on fuel injection, the fuel needs to be delivered at high pressure. you could also have a bad gasket between the carb, and the manifold.

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Q: How do you check why the fuel does not flow threw the intake in a 350 Chevrolet motor?
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