Even though your scanner says no codes, is the CEL illuminated? Wait-To-Start light coming on as normal? Check the wiring and connectors for the Injection Pressure Regulator (IPR) valve and CPS. Heck, might as well check the ICP connection too. Make sure the nut that holds the IPR's solenoid on is present and snug. Check the fuel pressure at the Schrader valve on the driver's side of the fuel bowl while cranking (should be a minimum of 25 psi at a minimum crank speed of 100 rpm). Check your main oil level. Cheers!

 

Ok I had a 250 with the 7.3 wish I never got rid of it have you have ever changed the glow plugs module or the glow plugs? That was the issue with mine I could.let it sit for a while and then it would fire off but the issue was that and it wasnt getting enough out of the working glow plugs and the model is only 50 $ mine did the same thing and with it beeing a 95 there is very limited codes for it my light would go out like I could start crank crank watched the tac and spedo move but would not finish a cycle to fire off I had no choice but to take it to a shop as mine died at a meter. Hope this help as this is a common thing with that engine

 

Triple check fuses.

 

One thing to add, try starting with the icp unplugged

 

Any smoke while cranking?

Have you done a buzz test?

What's the fuel level in the tank you were using? Did you try switching tanks?

 

I was having issues with starting a while back after rebuilding my fuel bowl and putting in a new mechanical fuel pump. I tried it all, and without the help of an electric fuel pump, you really need to get the air out of and get fuel into those lines from the pump that go into the head. My fuel level in the tank was only at 1/4, so I filled it to 3/4, also filled the fuel bowl to the brim. I hooked up a trickle charger to the battery so I didn't wear the batteries down, and crank crank crank for 10-15 seconds. Then I would crack the fuel lines at the head to relieve air pressure. I did this 4-5 times (enough to want to start over and pull the fuel bowl out), until I did it one more time and she fired right up! Good luck, but keep on trying.

Attached is a flowchart for 'crank, no start' on a 7.3 psd that helped.