I have a custom stainless tank from Rick's Tanks. I wanted to ensure that the fuel pickup was always able to pick up fuel especially when the fuel level was low. It is in a street car. I ended up using Holley Hyramat to get the job done. There is a mid tank baffle in the tank, so I used 2 separate mats to keep the mats in fuel at all times. It saved me from having to add a small sump on the bottom of what was already a low hanging tank.