Mercury - 6-Foot Propane Hose Fuel Delivery Series Reinforced Marine-Grade Polymer 8M0157822. Overview. Anyone who's run a small propane outboard knows the simple joy of gear that just works. No fuss, no complicated fuel systems - just clean power and an easy start. But even the most reliable setup depends on the hose connecting the tank to the engine. That's why Mercury Marine part 8M0157822 feels like such an important piece of the puzzle. It's the kind of part you trust without even thinking