I had been @ CG for 2 days. Although I don't see how this would matter, a week prior I put a brass right angle connector at the inlet port to stop the leaking hose. The other components of flow diagram (before the coach connection, and each individually checked for patency) are: pressure reducing device and "blue cartridge" filter. Screen is clean. Haven't seen another incidence of this situation happening (nor could I reproduce it). I'm inclined to go with the "hiccup theory" for now and will continue to monitor it.
2016 Ford F250 Lariat 6.7 L Diesel Powerstroke
For those who understand, things are as they are. For those who don't understand, things are as they are.