That tow truck looks a bit small for a 9,000lb ambulance :Wow1: :yikes: Those H1 rims look good, the wrap is not fooling anyone...H1 rims scream SWAT van! :elkgrin:
CPS failure is pretty common, I replaced mine and keep a spare in the glove box.
When cranking, do you get any smoke? white? grey? black? If no smoke, it could be fuel pump.
Check the Fuel pump? I had my fuel pump die on mine (1996 7.3L PSD) felt like it just ran out of fuel and wouldn't fire. The fuel pump is fun to change since it's under the turbo. In a truck, you can do it without removing the turbo, not sure about the van.
FoMoCO diesel troubleshooting guide
http://www.motorcraftservice.com/vdirs/quickref/default.asp?pageid=diesel
Scroll down to for the 95/96 7.3 troubleshooting guide.