Where is the emergency gas relay on the 2010 Chevy cobalt?

I meant that it would turn over but not start

GM doesn't use inertia fuel cutoff switches, so that's not the cause of your problem

I agree with RickMN. Examine the wiring to the fuel pump for something obvious. Listen for the fuel pump to run when you turn the key to the run position. Check the fuel pressure. If that all checks out OK then the problem lies elsewhere.