Mercury - Quicksilver Fuel Line 1/4" ID x 42" For Outboards, Sterndrives & Inboards 7381567. Overview. Fuel delivery isn't something you want to worry about when you're out on the water. The Mercury Marine 7381567 Quicksilver Fuel Line is built to make sure you never have to. This 1/4-inch inside diameter, 42-inch long hose is used on outboards, sterndrives, and inboards, carrying fuel smoothly from the pump to the carburetor. The flexible, marine-grade rubber construction holds up to ethanol-bl