I think I know what happened on that. You have to remember that an '08 manual covers the Superduty and the Econoline. The Econoline still got the 6.0L engine. They just left out that differentiation. Took them long enough to fix it, huh?
A service tip for you on the filter change I had with my 08. Upon putting on the new filters and cycling the key the 6 times per the manual my truck would not start. I could get it to catch briefly was about it.
I learned that holding down the fuel cutoff switch while cranking I was able to get it primed and running.
My switch is sensitive is the only explanation I have.
Switch is on the passenger side of the dash. Open the door and you will see the access panel on the side of the dash.