Had an issue with our Rosie Pumper/Tanker last night. We had an auto aid call where we had about a 30 minute drive in 25 degree weather. The pump (Waterous 1250 gpm midship) was dry (packing starting to leak, next on list to fix) and when we got there I couldn't get the electronic governor to allow me to increase past idle and the pressure gauge on the governor showed zero. I shut the pump down and verified I had water in the intake manifold (pump to tank is air operated) to rule out a valve problem or the check valve being frozen shut.
After sitting in the station over night, worked fine this morning.
Any ideas? To me it seemed like the line to the sensor on the electronic governor was to blame