Thread: Vapor locking issue please help

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Originally Posted by rspears

In the trunk is not good. Your pump needs to be below the tank so that it has a net positive suction head, read that to mean positive pressure on the pump inlet. I expect your pump instructions told you that.

very few pumps like to be above the tank lower or below center of the tank .most fuel pumps do not like to prime there self. pulling fuel up hill is hard on most of them. just that in it self could heat the pump up .i alway thought that gravity was helpful the pump never will run dry or over work to draw fuel the holley or the china knock off vein pumps will not take many dry runs