2000 Hyundai Accent Need to crank twice

You may have a fuel rail pressure problem, next cold start, turn the key to on and wait 3-4 sec, turn off and repeat again, on third try go to start, if it fires up, I would say the fuel rail pressure is leaking back into the tank to fast, you can also hook up a fuel pressure gauge and charge the system and then watch for pressure to drop off.

Thanks for your reply.i had small pin hole at my fuel line (from tank to rail) and i fixed it temporally. can this kind of hole can suck air and reduce fuel pressure. please explain.

The pin hole will allow fuel pressure to drop and when you start the injectors are opening but you do not have enough fuel pressure to spray the fuel, the system need fuel pressure high enough to do this, with the leak fixed you should not have a problem