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When doing a scavenger pump
Don't think gravity return with -10 or larger drain lines. Instead go smaller to keep velocity up.
We use -6 an from turbo to oil cooler then cooler to pump and pump to valve cover.
Think of it like this. You drink water through a straw very easy. But put a water hose in a tank and try sucking the water through the hose. The pump only has so much power so keep the velocity up to make it work better. Also if using a diaphragm pump use a cooler before the pump for added safety. A simple trans cooler will work just fine
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