No start on first attempt. Starts on second or third attempt

More than likely this is a weak fuel pump. When you turn the key and the engine just cranks over, then it starts on the following attempts then the fuel pump was able to prime the system and get it to start. Here is a guide that will help with how to test this and find out if it is low:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you need to replace the pump which I suspect it what we need to do, then here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Here is the process from the manual that will help with replacing the pump as well.

Please let us know if you have other questions. Thanks