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Under normal conditions---you do not need to reprime the pump before startup. If we haven't started the engine for a week, we might spin the engine over for 15 seconds before turning on the ignition. If we haven't started the engine for 1 month, we probably would reprime.

Think about a dry sump system as two separate systems, the pressure system and the scavenge system. The scavenge system goes from the oil pan to the pump and into the top of the tank. There is no way for the oil to get from the tank back into the oil pan if it is plumbed correctly. The tank keeps the pressure section always primed---and there is no way that gravity can drain a tank UNLESS the tank is mounted well above the engine.




Thanks! I was wondering about just spinning the engine over like you say. Thats basically the same as spinning it over with a drill. Also, I'm glad you confirmed the drain back thing too. I thought the exact same thing when I was told the oil would run back into the pan. The only line coming out of the bottom of the tank is the suction line that goes to the pump. Thanks for the clarification.