2003 VW Beetle cranks, but will not start

The engine will crank, but will not start. Trying to find out if anyone can help me figure out what might be wrong

I have a 2003 Vw Beetle and It will crank but will not start. We have changed the cam shaft sensor, crank shaft sensor, and checked the relays and fuses. It is not getting fire. After we changed everything the car would start, but once you turn off the engine and try and start it back up it would only crank but not start. I do not know what else to try. Please let me know if you know what is wrong with my Beetle. Thanks.

check the spark plugs to see if they are flooded out when started, run then try to start back up. If they are either ignition system stopped working, fuel pump shorted out, or injectors are leaking flooding the engine. try this video then https://www.youtube.com/watch?v=064Ilsz8Fzg