my car was low on oil and then i put some oil in it and it won't start sounds like it is out of gas but there's plenty of gas in it I think it might be the fuel injector.

 

turn the ignition on and listen for the fuel pump.

If thats good, then pull out a plug, plug it back into the wire, and ground the threads on the head and have someone crank it over and look for spark.

If both of those are good....then you have a bigger problem