Mercury - Fuel Injector EFI Fuel Delivery Component Stainless Steel & Composite 892123002. Overview. There's a kind of peace you feel when your engine fires up cleanly every time - no stumbling, no long crank, just a smooth start that tells you the day's off to a good beginning. The Mercury 892123002 Fuel Injector delivers that exact kind of confidence. It's the kind of part you don't think about often, yet it shapes every moment on the water: the quiet glide leaving the marina, the clean pull a