So I have been having a couple of issues and I think it's my fuel pump starting to go out.

Issues:
Long crank over times only when hot: Never have an issue cranking, regardless of outside temp, unless the vehicle has been ran and restarted. Approximately 1 hour after vehicle is shut down, I have very long restart times. This issue has been going on for a couple of years and I have never been able to pinpoint the problem.

Seems like there is a miss at times while driving: Lately while driving it seems that after I get in high gear and just a steady speed, I can feel a slight miss in the engine. I can feel it in the gas pedal, just like a very faint stumble, like every 10-15 seconds.. At first I thought this was a transmission issue, but I am leaning more toward a fuel starvation issue.

These fuel pumps are very expensive, so I don't want to just throw this part at it without more diagnosis. I currently do not have any check engine lights. I have ForScan Lite but didn't see any way to monitor fuel pressure with it. I have a manual fuel gauge that I have never connected to this truck. I can connect a computer and can connect full version of ForScan.

So what is the best way to test the current fuel pump under the conditions I have described? It appears this pump can only be replaced as a module (unlike units I have seen where you could replace the pump only on the module)?

 

Should be able to do so. You have to select the correct PID first, it's not automatically shown. Same with the Windows version.

 

PID list
https://diagrams.hissind.com/ford-pid-list/

 

I did exactly this with most of the same symptoms. 2016 5.0, if I ran for a few hours and parked when hot, sat for a few hours come back to looooong crank. Progressively got worse. I figured it was pressure build up in the fuel system and bleeding back to tank via check valve in fuel pump. Out of warranty and ford always told me it wouldn't replicate. Never had the miss feeling, when I changed my pump it was still an occasional long crank with only ever happening 1 time while not hot. Had 130,000km at the time, 150,000km now.

Had a shop change my fuel pump, been a year now and have not had any reoccurrence.

I suppose if you could check fuel pressure on start up it would show low while cranking. I didn't bother, just swapped fuel pumps and never had it again (so far).

 

I don't have Forscan but a hand held Scanner and can see the prestart fuel pressure before cranking when or if I had a need.
Sure saves money, hassle, and aggravation replacing parts on a hunch that does not fix the issue.
Additionally, I see in these forum posts, that not enough attention is paid to code descriptions where the first part mentioned is jumped on and is not the issue. The part name only refers to the system that has an issue. There are many parts involved in a system.
Good luck.