HELP 1991 300SL won't start
 

Wen't out for something to eat at a pub and 2 hours later decided to leave for home. The car wouldn't start! Turns over, has spark and when I disconnected the fuel lines on both sides of the fuel filter there is lots of fuel squirting out. Still will not start. Tried dumping a little gas in the air inlet and nothing!! Checked under the distributer cap and cleaned everything there and it looks fine. Took a plug wire off and held it near a ground and got good spark. Will check in the morning to see if it skipped time but I doubt it. I think it has something to do with the fuel injection unit. OR it could be the camshaft location sensor. How do I test this? How do I diagnois these things? PLEASE HELP:(
Car ran fine going to the place. What could possibly go wrong while it is off and not cooled down yet? Just running out of ideas.
Thanks in advance