Mercury - Rochester Carburetor Fuel Filter Fuel System Screen & O-Ring Kit 8767Q. Overview. Fuel systems on older carbureted engines can be surprisingly dependable, but only when they're fed clean, debris-free gasoline. That's where the Quicksilver 8767Q Fuel Filter quietly earns its keep. It's a small part, but one that plays a huge role in keeping classic Mercury engines running crisp and smooth. Whether you're easing away from the dock or powering across open water, a clean Rochester carburet