Fuel pump and filter?

yeah. Coolant leak is not related to a no-start that may have to do with fuel supply.
Coolant leak. Coolant circuit. In doubt? Pressure test it.

Diagnosing no-start is a whole nother separate path.

Plenty of cars have multiple unrelated issues at the same time.
For example, random German car
10 things wrong with it

or, also random German car
"ever since on Tuesday you aired up my tires, my engine won't start on Wednesday"
Yep, happens, unrelated.

Starting has a recipe. Required to start.
-starter
-battery
-fuel
-air
etc

with age and miles even if my LPFP still works I wouldn't mind throwing an upgrade at it anyway, that could provide an opportunity to lift the bed off, antisieze the bed bolts, clean the frame
and upgrade to a better, brand new pump, that changes the truck from no-filter, to having a filter, the way a vehicle should be