Chevrolet Repair: no start, camshaft sensor, crankshaft sensor

Question
HI ILL START BY GOING OVER WHAT I HAVE DONE REPLACED THE FUEL PUMP 6 MONTHS A GO. ALT ABOUT 3 MONTHS AGO THEN IT JUST STOPED RUNNING ABOUT 3 WEEKS AGO I REPLACED THE CRANKSHAFT SENSOR PUT A NEW CAP AND ROTOR AS WELL I BOUGHT A CAMSHAFT SENSOR THAT I DID NOT INSTALL  WHEN I PUT A SPARK PLUG IN THE #1 WIRE I WAS GETTING SPARK IF IT WAS IN TIME DONT I WHEN I PUT A TIMING LIGHT ON IT JUST TO SEE IF IT WOULD SHOW ME THAT THER WAS SPARK IT ONLY FLASHED ABOUT ONCE EVERY 30 SEC I CANT FIND THE THE TIMEING MARKS SO I COULD NOT CHECK THE TIMING I GUESS THE NEXT THING WOULD BE THE COIL TIMING CHAIN ??

Answer
what kind of car?  what year?  

those sensors you replaced usually have a code to tell you they are bad.  Do you have any codes?  

You dont start if you lack fuel, air or spark.  The trick is to find which you dont have.  Timing, vacuum leaks and other factors will intervene of course.  However if that was the issue, you would or should get an attempt start.  A spit or sputter.  Does this happen?  

If you are getting spark with your timing light, then you are probably lacking fuel or air.  Is the fuel pump coming on?  If not, check relay, fuse.  

Depend on year, could also be a computer problem.  Motor may not start because fuel is off because of another problem like theft control problem or even a low oil sensor.  Without the year and type this can have numerous causes.