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Next, we traced a line onto the outside of the fuel sump by using the fuel tank as a guide. According to the instructions, a 3/8-inch hole needs to be drilled 1/8-inch above our traced line on each side. However, for good measure, we spaced things out a bit and drilled four on each side of the sump. These holes will allow fuel to drain into the sump and act as a baffle inside the fuel tank.