Charlie, it could be any number of things. The crank sensor may be faulty but check for spark, fuel pressure, any number of electrical faults, etc. Troubleshooting someone saying "it won't run, what's wrong" is near impossible over the internet. For all we know, the battery could be missing. Not trying to be overly critical, but to be of any help at all we really need more details.

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth