Yamaha - Fixed Injector Fuel Delivery Component 7DH-R4138-01-00. Overview. Fuel injectors are one of those parts where you notice problems fast-rough running, poor throttle response, or uneven performance. When a fixed injector isn't doing its job, the engine just won't feel right, especially under load. I've seen engines smooth out immediately after replacing a worn or clogged injector. When it's working properly, fuel delivery stays consistent and the motor runs clean.. Key Features. • Consistent Fuel Delivery - Provides steady fuel flow for smooth and reliable engine operation.• Precision Fuel Distribution - Designed to deliver the correct amount of fuel for balanced combustion.• OEM Fit and Function - Matches factory specifications for proper installation and performance.• Supports Clean Engine Operation - Helps reduce rough running and uneven power output.. Engine & Boat Compatibility. Designed for Yamaha outboard engines that utilize a fixed injector as part of the fuel delivery