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There's probably lots of black soot on the inside ends of the tailpipes too.
I agree with Don, Frank and Sal. Something is wrong with the carb, no matter how new it is.
The bad mileage and all that black soot is from way too much fuel going thru the carb & engine.
You didn't mention the car using oil or blue-ish smoke out of the exhaust so it's not likely to be oil.
(and the plugs would be wet from the oil)
If the place you got the carb will do an exchange you might be out less dollars, but you could end up with another like the bad one you've got. Hopefully it's not an example of their normal quality of work.
Quote:
Originally Posted by frank long island
.... may have been rebuilt with parts that are not compatible with the fuels of today...
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Any internal part not compatible with ethanol could be ruined. Starting with the: float valve(s), floats, diaphragms... etc. etc.
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