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If the vehicle runs fine otherwise, then the needle valve and seat in the carburetor are defective or stuck open. Could be nothing more than debris in the seat. This allows all the fuel in the float bowl to drain out overnight thus requiring you to prime the carburetor. This fuel ends up in you oil pan and can cause some serious damage if not repaired. Remove the carburetor and remove and replace the needle valve and seat. Be sure to clean everything throughly with a good carb cleaner. Also check the float for pin holes and replace if necessary. You may want to totally rebuild the carburetor if you find it is in bad shape. Be sure and change your oil & filter before driving this vehicle as the oil is contaminated with fuel.

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Q: You have to prime your carburetor every morning on my Chevy 454?
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