I have a 2000 GMC Safari. It was running OK and started every time. I didn't start my van for five days and when I tried to start it, it would turn over, but not start up. After hooking up the diagnostic computer I got the code PO452, it doesn't seem that the EVAP sensor going out would cause the van to not start.

I replaced the fuel pump a year ago and replaced the plugs and wires after this go round.

Replacing the Ignition Control Module (ICM) often solves these problems. Very easy to do on your vehicle.