Mercury - Fuel Line Assembly, 12 Ft., 5/16" I.D. Fuel System 32-8M0061088. Overview. If you've run outboards long enough, you've probably chased fuel problems that ended up being nothing more than a worn-out hose or a weak primer bulb. This 12-foot Mercury fuel line assembly is built for the common clip-on setups used on Mercury, Mariner, and Force motors. The hose has a solid, dependable feel-flexible enough to route cleanly, but not the soft, collapsible stuff that starves an engine when you h