Car Kia Clarus starts ok when engine is cold or hot. When engine is mildly warm it fails to start.?

Question:
Engines starts fine when it is cold ( eg in the morning or after being parked for 4 hours). Its starts well when it is hot (within say 30 minutes of being parked. But when engine is mildly warm (after being left parked for say 1 or two hours) it fails to start. While cranking the engine, no voltage is supplied to the fuel pump. When cold it will start again. Any idea of what is causing the problem?
Thanks and regards

Answers:

Is the crank pulley supposed to turn? its froze .Dont know how to take it off?

K.i.a Killed In Action. Thease cars are junk, by American cars.

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engine oil in 2000 trans am?

well the fuel pump starts when you start turning that key of your ,
sounds like your fuel line up near the injector is getting clogged up cause pressure stays in the lines and the longer you leave it the pressure drops down .and when the pressure is still high in the line its keeping dirt pressed near the injector which causes it not to start.use high grade gas in you next fill up and put a bottle of fuel cleaner

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