I went with the sump because I like that design instead of sucking up a tube. My sump has a return pipe in the center. FASS also showed me they have a return you can cut into your fuel filling hose and slip it in if you get a sump like beans that doesn't have a fuel return. I cut and plugged the old line from the old pump and gutted my pump out of the tank leaving just the return from the engines high pressure pump and of coarse the fuel level sending unit. If you go with a sump make sure you get the hole in a good spot that won't interfere with the fuel sending float there's some helpful YouTube videos out there on this.