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If you put fuel into the intake and it starts and keeps running, replace the engine coolant sensor. If you put fuel into the intake and it starts but stalls it probably is a bad fuel pump or pressure regulator. Do a fuel pressure test. Need to know what model, year and engine you have to help you any more.

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Q: You have pressure in the fuel lines and it doesn't start you put fuel in the intake manifold and it starts Bad fuel pump?
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