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Depends on how you get it out.

If possible the tank should be drained and the lines disconected and flushed.

If you can drain or syphon the tank on a modern fuel injected car the system should circulate the bad gas back to the tank in just a minute or two when trying to start the car.

REMEMBER this will not work unless the tank has new good gas in it. The amount of bad gas in the lines should not hurt the new gas as long as you have a Half tank or more of new gas.

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Q: How long does it take to get bad fuel out of lines?
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