How do you prime a 1993 ford F350?

Answer 1

You should not need to. The fuel will get to the engine in a few revolutions. If not, you have no fuel flow.

by priming i assume you mean its a diesel and no a few revolutions wont kick it over. You will potentially need to crack injector lines by loosening the nuts at the injector, cranking it over on 20 second cranks with 2 minute breaks until fuel flow out at each nut. Once it begins to flow at the nut, you can tighten that one down. Repeat until all injector nuts are right and then you will be primed. Electric pumps eliminate this problem but have their own problems. Ensure you have proper fuel pressure at the filter head, should be around 5-7 psi. If you dont, the fuel pump on the passenger lower side of the block might be on its way out. test it, and if needed replace it, they are cheap.