Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
I apologize but I do not have much info here to go on, I need info such as make and model number, history such as it has been sitting or it was running and then would not start, etc.
For now all I can say is check the basics, air removed from fuel system bleed off, check fuel for water, oil level/pressure, fuel pressure, compression. then we will have more to go on or that will locate the problem.
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If for any reason you are not satisfied please reply back to me for further assistance to which I will be glad to help you. If you have any problems for any reason please reply back and let me know.
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I'd be happy to answer any other questions you have even if not related.