[Tommy]

I run a Holley electric fuel pump for my carbed 410 c.i. Windsor. Several years ago I used a pump with an internal pressure regulator and no return line. It worked fine for cruising about, but on a hot summer day at the track I experienced vapor lock at the pump. I disabled the pressure regulator at the pump and plumbed a regulator with a return line just downstream from the pump. That solved the problem.