For fuel boiling.
I had lots of problems with that before i ran a return system. fuel boil just don't happen when you keep sending it back to the fuel tank.
Deadhead system are the least expensive and the shortest life pumps. Return regulated pumps are WAY quit er as well.
I thought long and hard about running the regulator at the pump and returning it back to the tank. then just running a single line to car. But I needed a larger fuel line, ran up to the front anyways.
If i had more room (stock gas tank) it might make more sence.
