Isn't the boiling point of diesel well over 500 degrees f ? No vacuum to lower it without the engine running....
ICSC 1561 - DIESEL FUEL No. 2
Meridian....I had a similar situation for 2 years....
The genset would always start fine but after running would not restart till it cooled a bit.
Finally the genset just started to shut down from what seemed fuel starvation. I played around with the fuel pump and because it was always empty when checking, I stated down that road of a bad fuel pump.
In later rechecking the sensor connections, the exhaust sensor connector lug came apart with a tiny tug.
Recrimped and the genset has been working fine ever since.
But, the engine symptoms were slowing and low voltage as in low power....never a lower nu ber of cylinder issue.