Mercury - Fuel Injector Jet Drive & EFI Two-Stroke Outboard Engine Component Precision-Machined Alloy 840481T01. Overview. The Mercury 840481T01 Fuel Injector is built to deliver the right mix of fuel and performance for Mercury Jet Drive 240 and V150-250 EFI Two-Stroke outboards. Each injector is precision-engineered by Mercury Marine to ensure clean, consistent fuel delivery across the RPM range, giving you strong acceleration, smooth idling, and reliable starts every time.. Key Features. Purp