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Hi Clyde:
Since you mention "gas rail" I'm assuming fuel injected. 
I'd check the fuel pressure in the rail.  Should be around 40 PSI. 
If pressure is OK then injectors not working.  Time to check cps. 
You know the spark side is OK since it will run. 

If you have gas, and the fuel pump is working, all i can suggest is cycling the ignition on and off several times to fill the system.  Don't turn the engine over, just turn the key on until the fuel pump cuts out, and repeat.  Do this several times.  If gas is the problem, it should fire up.  If it doesn't, better check for spark.  Let me know how you make out.