Trouble starting

[Windy172cup]

Turn the key and the engine turns over but don't start, on the 3rd ish time it starts no trouble! Doesn't happen everytime I start the car. Any ideas? Starter motor, fuel not flowing? Help please

 

[Windy172cup]

Seems to happen when the engines hot. Anybody?

 

[Greener]

i have this problem also usually turns over twice and on the 3rd starts fine. however it does not do it all the time im confused as to what is causing this