street car or non drag race car, this could be an issue as the fuel will get hotter and hotter during use.
It's not an issue, millions of factory vehicles built that way.
Not circulating through the rails will put less heat into the fuel in the tank, but still gets rather hot at the rails as it's heat soaking during most conditions (idle/cruise/low fuel requirements).
Wide open throttle would introduce much higher flow of course (from cooler fuel in the tank) but would need to burn off what picked up a lot of heat first.
