Not trying to rain on your good fortune. Same thing happened to me, system got air bound one night I was wailing on it and let off the go pedal @ high rpm quickly and she died wouldn't start and had it towed home. Next AM looked for codes there were none, cracked inj nuts cranked for a while, tightened nuts and bingo. Then just driving along about a month later it died, wouldn't start, towed home, read codes and there was the P1688 (M) Internal Fuel Injection Pump
Controller Failure
Internal problem within the fuel injection pump. Low
power, engine derated, or engine stops.
It was suggested to me shortly after the first tow home mentioned above to start shopping for a VP . . .