That brushless motor Leimbach offers with their pump runs about 30% faster then the brushed motor. To my understanding , the brushed motor was approx 6000rpm on 12v & this this brushless is about 9000rpm.
4s lipo is 16.8v on a full charge & is down to around 14v when it needs to be recharged! I understand lifepo is lower overall voltage, but how much exactly I don't know.
Whatever voltage you choose to run, I'd recommend you back the voltage down for the pump to 11 -12v by adjusting the EPA, that'll give you plenty of volume for quick response. Run that pump too fast & it could self implode!
Better yet, does your radio allow for channel mixing? Mix the valves with your pump so the pump only turns on when you open a valve; prolongs run time per batt charge, make your oil quality last longer between changes & extend the life of your pump.
