| Oil and gas has actually filled the cylinders? Or, are you seeing a spray when cranking it over?
What are the exact symptoms? Do you have any codes? Engine light?
You should be EFI so the only way that you get fuel is for the pump and computer to be working. In theory, this takes it to spark problems. Do you have spark? If not, it might be as simple as a set of bad plug wires, baad coil or no power to the coil. It can also be a loss of signal from the crank position sensor etc.
The EFI is complex and not easy to troubleshoot. Do you have the service manual?
Now, the reason I doubt that oil and gas actually did "fill" the cylinders, is that if they were truly filled you would hydraulically lock up the engine until all the fluids bled by the or you pulled a plug out to let the fluids escape. | 
