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2003 Sonata v-6, 130,000 miles.  Occasionally engine will crank and not turn over.  Most often after i fill it up with gas, but sometimes it happens when i am just trying to start the car at other times.   Oxygen sensor changed.  Mechanic said it is not a symptom of a bad purge valve as i have No Codes.  When the car is running it is fine, not rough at all.  Is there any additive that might help? What else could it be?


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bad fuel pump


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