Mechanical Pump with Return Line- input/pictures/etc.

I totally agree with Rusty on this.:D
For what it's worth I ran my fuel lines up the firewall right next to the inner fender and then over to the carb.
It's also insulated, and I have an electric pump back at the tank with 3/8 feed and return with my T for the return right at the carb.
That exposed steel line all covered up with hot stuff from the pump to the carb was a dumb idea.