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The cause could be a fuel injector stuck open. On the 4.3 262 v6 Chevrolet used the spyder injection system which is know to stick open or closed. Also you could have a bad thermostat. The thermostat could not be closing properly causing the car to over cool and keep the engine control computer in open loop thus injecting excessive fuel constantly.

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Q: What causes a 2000 blazer 4.3 to have raw gas fumes out the exhaust and use excessive gas?
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