Fuel filter replacement

[GoldOxide_imp]

My dad bought a new sedan, years ago. Nice 6 cyl injected engine, and first time he goes on the interstate and at a little higher speed ... the engine simply quits in the left lane. He barely manages to pull over. What to do ? Try if it starts. No luck. Try again, no joy. Call for help, and when the truck arrives, the friendly helper asks for the keys, uses it, and ... roar ... in 2secs engine is running again. He leaves with a smile, after presenting the paperwork for the insurance.
My dad is stunned, okay he says “let’s go home”. He stays on the right lane this time, mumbling sth in his beard. And guess what happened next ?

Murphy arrived?

Was Dad able to glean from the friendly helper what the root cause was? Or it just happen to work at that moment? (i.e. Murphy went away)