stalled and will not start

If this is a diesel 7.3L then we need to suspect low pressure as that was really the only failure that would happen with these engines.

This means we need to start with the low-pressure side and make sure it is supplying enough fuel. Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I am attaching the process from the manual that will help with this as well.

However, we need to make sure we use a high-pressure line just to be sure you don't have any issue when testing.

Also, to confirm this we need to use ether to see if you can start the engine. If so, then we clearly have a fuel issue. At which point, we need to find out if there is enough flow. Even though you have fuel, if you don't have enough fuel then the engine will not run.

Let's start with this and go from there.

Thanks