72 Demon starts bogging sporadically once warm

I’ve gotta do something to reroute that line to stop it from just draining fuel out though.

Ou that's not good.
My Barracuda has exactly that; a steel line from the sender runs alongside the filler tube and re-enters the tube on the top,about 4 to 6 inches from the quarterskin. It's all on a continuous grade so liquid entering it during fill-up should drain back down. But occasionally I see something sputtering into the filler pipe, during fueling..