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My first system was inline. The second was in-tank. The radiator was literally heating the fuel up to the point where the small area of suction right at the pump intake must have been reaching its vacuum vapor point. I temped the fuel as it was happening, it was about 115*. But the back wall of the fuel cell where the air was blowing was 185*. When I first had people on Pirate tell me that fuel in the cell can get hot enough to vaporize under vacuum I didn't believe it. But when you think about fluid under pressure and how its vapor point is raised, it does seem logical that the vapor point would also be lowered under vacuum. (Which is true according to the laws of physics.)