Changed injectors in my 04 Cummins, now it won't start. No fuel leaks. Could I have got the valves not adjusted right?

 

If you're cranking it over and you don't hear a loud smacking sound, the valves probably aren't the problem You probably just have some air in one of the lines that is not allowing the injector/s to pop. I would recheck your fuel lines and make sure they are tight with no cracks from install. Then move onto the electrical connections make sure they are all connected and don't have some piece of gunk interfering with the connection, always make sure to disconnect your battery when doing this!!!! Make sure to replace your fuel filter, and make sure the lift pump is working properly.
When I replaced the injectors on my 04 Dodge the valve lash was within spec after 180,000 miles. Did you check and/or readjust the valve lash after installing the injectors?

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You might try loosening the fuel line at each injector and turning the key to the ON position to purge the lines as well.

 

I had the same thing happen. The injector tubes were the problem. It won't leak. Your fuel will just go right back into the tank. Tq is supposed to be 30ft-lbs I think, by my wrench must have been off. I tightened them down to 50ft/lbs and haven't had any problems since.