Car engine turn over but wont start

I am going to give you a walk through diagnostic for your situation that goes into great detail ablout the most probable cuases for this issue.
When it talks about getting the, "Trouble Codes' pulled, any Advan ce Auto or Auto Zone wil do this for free. Also, any tests such as, fuel pressure testing, etc. can be done by borrowing test kits from both aforementioned parts stores and they loan them out for free and have literature and will help you understand how to use the tool. Plus you have us to get you through any testing so don't be intimidated. Things do take time though so you can always take it to a repair facility and at least you will be educated on what they should be looking for and how they might go about doing so. To find a reputable repair facility use this site's search engine and the banner ads that come up on the page you get back from the searcg will have banner ads for shops nearest to you.
Just follow the steps of the walk through and by process of elimination it will help to find the problem.
Just use the link below:
https://www.2carpros.com/expert/questions/2003-bmw-318i-car-engine-turn-over-wont-start