Starting issue after replacing rear shocks
 

i recently had my 2006 Mazda 3 (2.3L) on jack stands in the rear to replace rear shocks and shock mounts. It was sitting that way for around 36 hours, while I pb blasted the hardware. I've never had any starting issues in the past but when I finished the job the car would turn over but would not fire up. It had about 3/4 of a tank of fuel and now is sitting level on all four wheels. No leaks of fuel or other wise visible under the car. Any ideas would be greatly appreciated.

Can you hear the in tank fuel pump spinning? If not, while you were replacing the shock absorbers, you likely accidently disconnected the wiring harness at the rear that goes to the pump.