Mercury - Fuel Boost Pump Kit DFI / DTS 3.0L Series Marine-Grade Fuel Delivery 888733T02. Overview. There's a certain comfort in hearing your outboard settle into a strong, steady idle - that low, confident hum that tells you everything beneath the cowling is working the way it should. When you're running a high-output two-stroke, especially one that's spent its fair share of mornings chasing bait lines or powering through open chop, you depend on clean, consistent fuel delivery. The Mercury Mar