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Quite a few different things could cause this problem to happen. If the fuel lines are not pressurized when the engine is off, then vapor lock is very likely the problem. This is a problem I have with my 2000 Elantra. I have to floor the gas petal to get the engine to start. Having a full tank of gas helps some what but does not get rid of the problem completely.

Another problem could be the mains relay is faulty preventing the fuel pump from operating and usually shows up during hot weather. A bad ignition coil could also be the problem. This problem usually shows up during the hot part of the day and disappears during the evening. Basically the car won't start in the day but will after the sun has set and the air outside has cooled down. The last thing to check is the Air Intake Temperature sensor which I understand is a part of the MAF sensor on the air intake housing where the air filter is. Using an OBDI II reader check the temperature. If it is reading a temperature that is too low on a hot day, then it is causing the engine to be flooded and will need to be replaced.

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Q: Why does Hyundai accent not start in hot weather?
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