I have a 02 blazer. I replaced cap and rotor,new plugs and wires and new starter. Also replaced crankshaft position sensor. Got it to start after several attempts but now it won’t start again.Battery is at 12v. Smell fuel when cranking but don’t see any. Any suggestions? Thanks

 

The crankshaft position sensor.....the one on the front of the engine, down by the harmonic balancer, right? If so, then you will need to perform a CKS relearn, which requires a capable scan tool to do so.
However that should not be the issue with not starting.
Assume engine is cranking, just not running, right?
Check for spark at the coil, then at the plugs.
Rotor is on correctly, screwed-down tight, right?

Hopefully you used Delco for the cap and rotor. The 4.3L engine ECM just does not like aftermarket parts.
Did you move the ignition module?

How about fuel pump and fuel injector fuses...check them?

Check the things above and let us know what you find.

Later,